1When a tuning fork is struck on a rubber pad and brought near the ear, what is heard? And what do you feel when you then touch its prongs with your fingers?
2What are the sources of sound around you? Name any three and say which part of each one vibrates.
3Find the speed of a sound whose frequency is 66 Hz and whose wavelength is 5 m.
4At zero degrees Celsius the speed of sound is 332 m/s. If the frequency is 40 Hz, what is the wavelength?
5Why is a sound wave called a mechanical wave?
6Why is a sound wave called a longitudinal wave?
7Write the relation between frequency and time period, and use it to find the time period of a sound of frequency 200 Hz.
8In the same medium, what happens to the speed of sound if the frequency is doubled? Give the reason.
9Both wavelength and amplitude are measured in metres. Bring out the difference between them.
10A sound has a speed of 340 m/s and a wavelength of 2 m. What is its frequency?