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Class 10 Physics Sound 11.18. What are the uses of ultrasound in medicine?


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11.18. What are the uses of ultrasound in medicine?

Example 2.1 A sitar string vibrates at 400 \mathrm{~Hz} . What is the time period of this vibration?
Example  2.1 A sitar string vibrates at  400 \mathrm{~Hz} . What is the time period of this vibration?

Example 2.1 A sitar string vibrates at 400 \mathrm{~Hz} . What is the time period of this vibration?

iv. Astronauts in space need to communicate with each other by radio links because(a) sound waves travel very slowly in space(b) sound waves travel very fast in space(c) sound waves cannot travel in space(d) sound waves have low frequency in space
iv. Astronauts in space need to communicate with each other by radio links because(a) sound waves travel very slowly in space(b) sound waves travel very fast in space(c) sound waves cannot travel in space(d) sound waves have low frequency in space

iv. Astronauts in space need to communicate with each other by radio links because(a) sound waves travel very slowly in space(b) sound waves travel very fast in space(c) sound waves cannot travel in space(d) sound waves have low frequency in space

vi. For a normal person audible frequency range for sound wave lies between(a) 10 \mathrm{~Hz} and 10 \mathrm{kHz} (b) 20 \mathrm{~Hz} and 20 \mathrm{kHz} (c) 25 \mathrm{~Hz} and 25 \mathrm{kHz} (d) 30 \mathrm{~Hz} and 30 \mathrm{kHz}
vi. For a normal person audible frequency range for sound wave lies between(a)  10 \mathrm{~Hz}  and  10 \mathrm{kHz} (b)  20 \mathrm{~Hz}  and  20 \mathrm{kHz} (c)  25 \mathrm{~Hz}  and  25 \mathrm{kHz} (d)  30 \mathrm{~Hz}  and  30 \mathrm{kHz}

vi. For a normal person audible frequency range for sound wave lies between(a) 10 \mathrm{~Hz} and 10 \mathrm{kHz} (b) 20 \mathrm{~Hz} and 20 \mathrm{kHz} (c) 25 \mathrm{~Hz} and 25 \mathrm{kHz} (d) 30 \mathrm{~Hz} and 30 \mathrm{kHz}

11.17. Describe the importance of acoustic protection.
11.17. Describe the importance of acoustic protection.

11.17. Describe the importance of acoustic protection.

11.9. What do you mean by the term intensity level of the sound? Name and define the unit of intensity level of sound.
11.9. What do you mean by the term intensity level of the sound? Name and define the unit of intensity level of sound.

11.9. What do you mean by the term intensity level of the sound? Name and define the unit of intensity level of sound.

11.7. A ship sends out ultrasound that returns from the seabed and is detected after 3.42 \mathrm{~s} . If the speed of ultrasound through seawater is 1531 \mathrm{~ms}^{-1} what is the distance of the seabed from the ship?Ans. (2618 m)
11.7. A ship sends out ultrasound that returns from the seabed and is detected after  3.42 \mathrm{~s} . If the speed of ultrasound through seawater is  1531 \mathrm{~ms}^{-1}  what is the distance of the seabed from the ship?Ans. (2618 m)

11.7. A ship sends out ultrasound that returns from the seabed and is detected after 3.42 \mathrm{~s} . If the speed of ultrasound through seawater is 1531 \mathrm{~ms}^{-1} what is the distance of the seabed from the ship?Ans. (2618 m)

11.18. What are the uses of ultrasound in medicine?
11.18. What are the uses of ultrasound in medicine?
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11.18. What are the uses of ultrasound in medicine?

2.2 Fill in the blanks.(xi) Sound which is agreeable to human ear is called sound.
 2.2  Fill in the blanks.(xi) Sound which is agreeable to human ear is called sound.

2.2 Fill in the blanks.(xi) Sound which is agreeable to human ear is called sound.

2.2 Fill in the blanks.(iv) The vibratory motion of the bob of a simple pendulum is.
 2.2  Fill in the blanks.(iv) The vibratory motion of the bob of a simple pendulum is.

2.2 Fill in the blanks.(iv) The vibratory motion of the bob of a simple pendulum is.

11.8. Will two separate 50 \mathrm{~dB} sounds together constitute a 100 \mathrm{~dB} sound? Explain.
11.8. Will two separate  50 \mathrm{~dB}  sounds together constitute  a 100 \mathrm{~dB}  sound? Explain.

11.8. Will two separate 50 \mathrm{~dB} sounds together constitute a 100 \mathrm{~dB} sound? Explain.

11.3. At a particular temperature the speed of sound in air is 330 \mathrm{~m} \mathrm{~s}^{-1} . If the wavelength of a note is 5 \mathrm{~cm} calculate the frequency of the sound wave. Is this frequency in the audible range of the human ear?
11.3. At a particular temperature the speed of sound in air is  330 \mathrm{~m} \mathrm{~s}^{-1} . If the wavelength of a note is  5 \mathrm{~cm}  calculate the frequency of the sound wave. Is this frequency in the audible range of the human ear?

11.3. At a particular temperature the speed of sound in air is 330 \mathrm{~m} \mathrm{~s}^{-1} . If the wavelength of a note is 5 \mathrm{~cm} calculate the frequency of the sound wave. Is this frequency in the audible range of the human ear?

11.5. A student says that the two terms speed and frequency of the wave refer to the same thing. What is your response?
11.5. A student says that the two terms speed and frequency of the wave refer to the same thing. What is your response?

11.5. A student says that the two terms speed and frequency of the wave refer to the same thing. What is your response?

2.2 Fill in the blanks.(vii) Longitudinal waves consist of ___ and and as they pass through a medium the particles of the medium vibrates in the of the waves.
 2.2  Fill in the blanks.(vii) Longitudinal waves consist of ___ and and as they pass through a medium the particles of the medium vibrates in the of the waves.

2.2 Fill in the blanks.(vii) Longitudinal waves consist of ___ and and as they pass through a medium the particles of the medium vibrates in the of the waves.

2.2 Fill in the blanks.(iii) Whale executing a simple harmonic motion the magnitude of the acceleration of the body is to its distance from the mean position and the direction of the acceleration is always towards the
 2.2  Fill in the blanks.(iii) Whale executing a simple harmonic motion the magnitude of the acceleration of the body is to its distance from the mean position and the direction of the acceleration is always towards the

2.2 Fill in the blanks.(iii) Whale executing a simple harmonic motion the magnitude of the acceleration of the body is to its distance from the mean position and the direction of the acceleration is always towards the

1. An object is connected to one end of a horlzontal spring whose other end is fixed. The object is pulled to the right (in the positive x -direction) by an externally applied force of magnitude 20 \mathrm{~N} causing the spring to stretch through a dIsplacement of 1 \mathrm{~cm} (a) Determine the value of force constant if the mass of the object is 4 \mathrm{~kg}(\mathrm{~b}) Determine the period of. osclllation when the applied force is suddenly removed.
1. An object is connected to one end of a horlzontal spring whose other end is fixed. The object is pulled to the right (in the positive  x -direction) by an externally applied force of magnitude  20 \mathrm{~N}  causing the spring to stretch through a dIsplacement of  1 \mathrm{~cm}  (a) Determine the value of force constant if the mass of the object is  4 \mathrm{~kg}(\mathrm{~b})  Determine the period of. osclllation when the applied force is suddenly removed.

1. An object is connected to one end of a horlzontal spring whose other end is fixed. The object is pulled to the right (in the positive x -direction) by an externally applied force of magnitude 20 \mathrm{~N} causing the spring to stretch through a dIsplacement of 1 \mathrm{~cm} (a) Determine the value of force constant if the mass of the object is 4 \mathrm{~kg}(\mathrm{~b}) Determine the period of. osclllation when the applied force is suddenly removed.

11.2. We can recognize persons speaking with the same loudness from their voice. How is this possible?
11.2. We can recognize persons speaking with the same loudness from their voice. How is this possible?

11.2. We can recognize persons speaking with the same loudness from their voice. How is this possible?

(v) If frequency of waves f=30 cycles per second and wiave length \lambda=0.2 metre then the velocity of waves is per second.(a) 6 (b) 150(c) 0.0066 (d) 8
(v) If frequency of waves  f=30  cycles per second and wiave length  \lambda=0.2  metre then the velocity of waves is per second.(a) 6 (b) 150(c)  0.0066 (d) 8

(v) If frequency of waves f=30 cycles per second and wiave length \lambda=0.2 metre then the velocity of waves is per second.(a) 6 (b) 150(c) 0.0066 (d) 8

2.4 Pick out true and false.(iv) Force applied to a spring is inversely proportional to the extension in the spring.
2.4 Pick out true and false.(iv) Force applied to a spring is inversely proportional to the extension in the spring.

2.4 Pick out true and false.(iv) Force applied to a spring is inversely proportional to the extension in the spring.

11.8. The highest frequency sound humans can hear is about 20000 \mathrm{~Hz} . What is the wavelength of sound in air at this frequency at a temperature of 20^{\circ} \mathrm{C} ? What is the wavelength of the lowest sounds we can hear of about 20 \mathrm{~Hz} ? Assume the speed of sound in air at 20^{\circ} \mathrm{C} is 343 \mathrm{~ms}^{-1} .
11.8. The highest frequency sound humans can hear is about  20000 \mathrm{~Hz} . What is the wavelength of sound in air at this frequency at a temperature of  20^{\circ} \mathrm{C} ?  What is the wavelength of the lowest sounds we can hear of about  20 \mathrm{~Hz}  ? Assume the speed of sound in air at  20^{\circ} \mathrm{C}  is  343 \mathrm{~ms}^{-1} .
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11.8. The highest frequency sound humans can hear is about 20000 \mathrm{~Hz} . What is the wavelength of sound in air at this frequency at a temperature of 20^{\circ} \mathrm{C} ? What is the wavelength of the lowest sounds we can hear of about 20 \mathrm{~Hz} ? Assume the speed of sound in air at 20^{\circ} \mathrm{C} is 343 \mathrm{~ms}^{-1} .

4. A standing wave is established in a 120 \mathrm{~cm} long string fixed at both ends. The string vibrates in four segments when driven at 120 \mathrm{~Hz} (a) Determine the wavelength (b) What is the fundamental frequency?
4. A standing wave is established in a  120 \mathrm{~cm}  long string fixed at both ends. The string vibrates in four segments when driven at  120 \mathrm{~Hz}  (a) Determine the wavelength (b) What is the fundamental frequency?
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4. A standing wave is established in a 120 \mathrm{~cm} long string fixed at both ends. The string vibrates in four segments when driven at 120 \mathrm{~Hz} (a) Determine the wavelength (b) What is the fundamental frequency?

2.2 Fill in the blanks.(v) The waves in which the parucies of the medium vibrate in a direction perpendicular to the direction of propagation of waves arc called
 2.2  Fill in the blanks.(v) The waves in which the parucies of the medium vibrate in a direction perpendicular to the direction of propagation of waves arc called
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2.2 Fill in the blanks.(v) The waves in which the parucies of the medium vibrate in a direction perpendicular to the direction of propagation of waves arc called

Example 2.4There are 48 holes in a disc sircn arranged in the form of a ring. The disc rotates at 400 revolutions per half minute. What is the frequency of the sound emilted by an air jet placed against the holes.
Example 2.4There are 48 holes in a disc sircn arranged in the form of a ring. The disc rotates at 400 revolutions per half minute. What is the frequency of the sound emilted by an air jet placed against the holes.
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Example 2.4There are 48 holes in a disc sircn arranged in the form of a ring. The disc rotates at 400 revolutions per half minute. What is the frequency of the sound emilted by an air jet placed against the holes.

2.8 Calculate the length of a seconds pendulum taking \mathrm{g} equal to 9.8 \mathrm{~m} / \mathrm{s}^{2} (A seconds pendulum is a simple pendulum having a time period of 2 seconds).
 2.8  Calculate the length of a seconds pendulum taking  \mathrm{g}  equal to  9.8 \mathrm{~m} / \mathrm{s}^{2}  (A seconds pendulum is a simple pendulum having a time period of 2 seconds).
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2.8 Calculate the length of a seconds pendulum taking \mathrm{g} equal to 9.8 \mathrm{~m} / \mathrm{s}^{2} (A seconds pendulum is a simple pendulum having a time period of 2 seconds).

11.4. What do you understand by the longitudinal wave? Describe the longitudinal nature of sound waves.
11.4. What do you understand by the longitudinal wave? Describe the longitudinal nature of sound waves.
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11.4. What do you understand by the longitudinal wave? Describe the longitudinal nature of sound waves.

11.4. Why must the volume of a stereo in a room with wall-to-wall carpet be tuned higher than in a room with a wooden floor?
11.4. Why must the volume of a stereo in a room with wall-to-wall carpet be tuned higher than in a room with a wooden floor?
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11.4. Why must the volume of a stereo in a room with wall-to-wall carpet be tuned higher than in a room with a wooden floor?

(ii) Prove that the vibratory motion of a mass attached to a spring is simple harmonic motion
(ii) Prove that the vibratory motion of a mass attached to a spring is simple harmonic motion
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(ii) Prove that the vibratory motion of a mass attached to a spring is simple harmonic motion

2.5 A hody of mass 0.3 \mathrm{~kg} is attached to a horizontal spring. If the valve of the spring constant is 5 \mathrm{~N} / \mathrm{m} find the time period of the body if it is given a small displacement.
 2.5  A hody of mass  0.3 \mathrm{~kg}  is attached to a horizontal spring. If the valve of the spring constant is  5 \mathrm{~N} / \mathrm{m}  find the time period of the body if it is given a small displacement.
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2.5 A hody of mass 0.3 \mathrm{~kg} is attached to a horizontal spring. If the valve of the spring constant is 5 \mathrm{~N} / \mathrm{m} find the time period of the body if it is given a small displacement.

11.14. If we clap or speak in front of a building while standing at a particular distance we rehear our sound after sometime. Can you explain how does this happen?
11.14. If we clap or speak in front of a building while standing at a particular distance we rehear our sound after sometime. Can you explain how does this happen?
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11.14. If we clap or speak in front of a building while standing at a particular distance we rehear our sound after sometime. Can you explain how does this happen?

Example 11.2: Calculate the frequency of a sound wave of speed 340 \mathrm{~m} \mathrm{~s}^{-1} and wavelength 0.5 \mathrm{~m} .
Example 11.2: Calculate the frequency of a sound wave of speed  340 \mathrm{~m} \mathrm{~s}^{-1}  and wavelength  0.5 \mathrm{~m} .
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Example 11.2: Calculate the frequency of a sound wave of speed 340 \mathrm{~m} \mathrm{~s}^{-1} and wavelength 0.5 \mathrm{~m} .

MDCAT/ ECAT question bank