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1. What are the factors on which speed of sound depends on?
2. Sound cannot travel through vacuum. Explain why.
3. What is noise? How is it different from of music?
4. Voice of a woman is shriller than that of a man. Explain.
5. Difine the following terms:
a) Sound
b) Frequency
c) Amplitude
d) Time period
e) Audible sounds
f) Inaudible sounds
g) Infrasonic sounds
h) Ultrasonic sounds
i) Super sonic speed
j) Sonic boom
NUMERICALS
1. Particle ‘A’ vibrates 50 times in 5 seconds, particle ‘B’ vibrates 40 times in 2 seconds and particle ’C’ vibrates 60 times in 10 seconds. Calculate the time period and frequency of particles A,B&C and arrange in descending order.
2. A girl is on a swing which oscillates 12 times in 6 seconds. Find the frequency and time period of the swing.
3. Calculate the time period of an object whose frequency is 100 Hz.