# Class 10 Physics Simple Harmonic Motion And Waves

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$vii. A large ripple tank with a vibrator working at a frequency of 30 \mathrm{~Hz} produces complete waves in a distance of 50 \mathrm{~cm} . The velocity of the wave is(a) 53 \mathrm{~cm} \mathrm{~s}^{-1} (b) 60 \mathrm{~cm} \mathrm{~s}^{-1} (c) 750 \mathrm{~cm} \mathrm{~s}^{-1} (d) 1500 \mathrm{~cm} \mathrm{~s}^{-1}$

$10.2. Think of several examples of motion in everyday life that are simple harmonic.$

$10.9. At one end of a ripple tank 80 \mathrm{~cm} across a 5 \mathrm{~Hz} vibrator produces waves whose wavelength is 40 \mathrm{~mm} . Find the time the waves need to cross the tank.Ans. (4 s)$

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

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

$10.4. How can you define the term wave? Elaborate the difference between mechanical and electromagnetic waves. Give examples of each.$