JSUNIL TUTORIAL, BIHAR IX CH � SOUND QUESTIONS
Q 1 Frequency of a wave motion is 250 Hz. What is its time period?
Q 2. What do you mean by an Oscillation of a sound wave?
Q 3 Derive a relation between speed, frequency and wavelength of a sound wave?
Q 4 A sound wave has a frequency of 2 kHz and wavelength 40 cm. Calculate its speed?
Q 5 Calculate the wavelength of a sound wave whose frequency is 220 Hz and speed is 440 m/s in a given
medium?
Q 6 Calculate a) the wavelength b) the time period of a tuning fork of frequency 512 Hz that is set to vibrate. Velocity of sound in air is 320 m/s.
Q 7 What is the wavelength of sound waves produced in air by a vibrating tuning fork whose frequency is
256 Hz when the velocity of sound in air is 330 m/s ?
Q 8 Why the flash of lightning due to collision of clouds is seen much before the thunder, although both occur simultaneously?
Q 9 What do you understand by speed of sound? How does it depend upon the medium and temperature?
Q 10 What is reflection of sound? Explain the laws of reflection with respect to sound?
Q 11 What is Echo. Explain the conditions that have to be satisfied to hear an echo?
Q 12 Why do echoes produced in an empty auditorium usually decrease when it is full of audience?
Q 13 What is reverberation?
Q 14 A girl clapped his hands near a cliff and heard the echo after 5 s. What is the distance of the cliff from
the person if the speed of the sound, velocity of sound in air is taken as 346 m/s?
Q 15 A boy fires a gun and hears the echo 2 seconds later. If he is 480 m away from a wall, calculate the
velocity of sound in air?
Q 16 Explain the term audible range, Infrasonic frequencies, Ultrasonic frequencies?
Q 17 Explain how is the principle of echo used by
(a) The bat during its flight at night. (b) The dolphin to locate small fish as its prey.
Q 18 Figure shows a waveform of frequency 50 Hz in a string. The numbers in the string represent distance
in centimeter. For this wave motion, find: (a) wavelength (b) amplitude,
Q.19. What should be the minimum distance between a sound source and reflector for a distinct echo?
Q.20. Which part of the ear turns pressure variations into electrical signals?
Fore more practice : IX Chapter � Sound: Test Paper like (Q)1. Fill in the blanks: (a) The loudness of sound is proport...
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