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First Year Physics Waves 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


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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.

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.

16.20 Discuss in detail the light emitting diodes?
16.20 Discuss in detail the light emitting diodes?

16.20 Discuss in detail the light emitting diodes?

Hole is equivalent to:A) A neutral particleB) A positive chargeC) A negative chargeD) An electron
Hole is equivalent to:A) A neutral particleB) A positive chargeC) A negative chargeD) An electron

Hole is equivalent to:A) A neutral particleB) A positive chargeC) A negative chargeD) An electron

10.4. A simple pendulum completes one vibration in two seconds. Calculate its length when g=10.0 \mathrm{~ms}^{-2} .Ans. (1.02 m)
10.4. A simple pendulum completes one vibration in two seconds. Calculate its length when  g=10.0 \mathrm{~ms}^{-2} .Ans. (1.02 m)

10.4. A simple pendulum completes one vibration in two seconds. Calculate its length when g=10.0 \mathrm{~ms}^{-2} .Ans. (1.02 m)

10.1. If the length of a simple pendulum is doubled what will be the change in its time period?
10.1. If the length of a simple pendulum is doubled what will be the change in its time period?

10.1. If the length of a simple pendulum is doubled what will be the change in its time period?

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.

10.5. Distinguish between longitudinal and transverse waves with suitable examples.
10.5. Distinguish between longitudinal and transverse waves with suitable examples.

10.5. Distinguish between longitudinal and transverse waves with suitable examples.

(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

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

16.13 Gtve the energy band description of semiconductors?
16.13 Gtve the energy band description of semiconductors?

16.13 Gtve the energy band description of semiconductors?

(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

16.3 A nanosecond is 10^{-9} \mathrm{~s} (a) What is the frequency of electromagnetic wave whose period is lns?(b) What is its wave length? (c) To what class of electromagnetic waves does it belong?
16.3 A nanosecond is  10^{-9} \mathrm{~s}  (a) What is the frequency of electromagnetic wave whose period is lns?(b) What is its wave length? (c) To what class of electromagnetic waves does it belong?

16.3 A nanosecond is 10^{-9} \mathrm{~s} (a) What is the frequency of electromagnetic wave whose period is lns?(b) What is its wave length? (c) To what class of electromagnetic waves does it belong?

10.1. The time period of a simple pendulum is 2 \mathrm{~s} . What will be its length on the Earth? What will be its length on the Moon if g_{\mathrm{m}}=g_{\mathrm{e}} / 6 ? where g_{\mathrm{e}}=10 \mathrm{~ms}^{-2} .Ans. (1.02 \mathrm{~m} 0.17 \mathrm{~m})
10.1. The time period of a simple pendulum is  2 \mathrm{~s} . What will be its length on the Earth? What will be its length on the Moon if  g_{\mathrm{m}}=g_{\mathrm{e}} / 6  ? where  g_{\mathrm{e}}=10 \mathrm{~ms}^{-2} .Ans.  (1.02 \mathrm{~m} 0.17 \mathrm{~m})

10.1. The time period of a simple pendulum is 2 \mathrm{~s} . What will be its length on the Earth? What will be its length on the Moon if g_{\mathrm{m}}=g_{\mathrm{e}} / 6 ? where g_{\mathrm{e}}=10 \mathrm{~ms}^{-2} .Ans. (1.02 \mathrm{~m} 0.17 \mathrm{~m})

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?

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.

i. Which of the following is an example of simple harmonic motion?(a) the motion of simple pendulum(b) the motion of ceiling fan(c) the spinning of the Earth on its axis(d) a bouncing ball on a floor
i. Which of the following is an example of simple harmonic motion?(a) the motion of simple pendulum(b) the motion of ceiling fan(c) the spinning of the Earth on its axis(d) a bouncing ball on a floor

i. Which of the following is an example of simple harmonic motion?(a) the motion of simple pendulum(b) the motion of ceiling fan(c) the spinning of the Earth on its axis(d) a bouncing ball on a floor

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

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

2.8 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).

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).

2.2 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.

Majority carriers in P-type substances are:A) ElectronsB) HolesC) PositronsD) Negative ions
Majority carriers in P-type substances are:A) ElectronsB) HolesC) PositronsD) Negative ions
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Majority carriers in P-type substances are:A) ElectronsB) HolesC) PositronsD) Negative ions

16.21 What do you understand by valence band. conductlon band and energy gap ?
16.21 What do you understand by valence band. conductlon band and energy gap ?
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16.21 What do you understand by valence band. conductlon band and energy gap ?

16.24 In what wave-length range do radar signals lle?
16.24 In what wave-length range do radar signals lle?
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16.24 In what wave-length range do radar signals lle?

16.6 Describe the electromagnetic wave spectrum?
 16.6  Describe the electromagnetic wave spectrum?
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16.6 Describe the electromagnetic wave spectrum?

16.3 A radlo transmitter has a vertical antenna. Does It matter whether the recelving antenna is vertlcal or hortzontal ?
16.3 A radlo transmitter has a vertical antenna. Does It matter whether the recelving antenna is vertlcal or hortzontal ?
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16.3 A radlo transmitter has a vertical antenna. Does It matter whether the recelving antenna is vertlcal or hortzontal ?

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
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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

10.8. Water waves in a shallow dish are 6.0 \mathrm{~cm} long. At one point the water moves up and down at a rate of 4.8 oscillations per second.(a) What is the speed of the water waves?(b) What is the period of the water waves?Ans. \left(0.29 \mathrm{~ms}^{-1} 0.21 \mathrm{~s}\right)
10.8. Water waves in a shallow dish are  6.0 \mathrm{~cm}  long. At one point the water moves up and down at a rate of  4.8  oscillations per second.(a) What is the speed of the water waves?(b) What is the period of the water waves?Ans.  \left(0.29 \mathrm{~ms}^{-1} 0.21 \mathrm{~s}\right)
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10.8. Water waves in a shallow dish are 6.0 \mathrm{~cm} long. At one point the water moves up and down at a rate of 4.8 oscillations per second.(a) What is the speed of the water waves?(b) What is the period of the water waves?Ans. \left(0.29 \mathrm{~ms}^{-1} 0.21 \mathrm{~s}\right)

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.

Minority carriers in \mathrm{N} -type substances are:A) HolesB) ElectronsC) ProtonsD) Positive ions
Minority carriers in  \mathrm{N} -type substances are:A) HolesB) ElectronsC) ProtonsD) Positive ions
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Minority carriers in \mathrm{N} -type substances are:A) HolesB) ElectronsC) ProtonsD) Positive ions

10.9. Explain the following properties of waves with reference to ripple tank experiment:a. Reflectionb. Refractionc. Diffraction
10.9. Explain the following properties of waves with reference to ripple tank experiment:a. Reflectionb. Refractionc. Diffraction
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10.9. Explain the following properties of waves with reference to ripple tank experiment:a. Reflectionb. Refractionc. Diffraction

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.

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