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##### 10.8. Waves are the means of energy transfer without transfer of matter. Justify this statement with the help of a simple experiment.

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.