Engineering Physics I Practice Test 7

1. A particle on the trough of a wave at any instant will come to the mean position after a time (T=time period).

2. The waves produced by a motor boat sailing in water are __________

3. When can sound be heard over long distances?

4. If two sound waves having a phase difference of 60°, then they will have a path difference of __________

5. Speed of recession of a galaxy is proportional to its distance __________

6. Sensitivity increases with a decrease in intensity.

7. The loudness and pitch of a sound note depends on __________

8. A boat at anchor is rocked by waves, whose crests are 100m apart and velocity is 25m/s. The boat bounces up once in every __________

9. The equation of wave is given by
y=10sin⁡(2πt/30+α)
If the displacement is 5cm at t=0, then the total phase at t=7.5s will be __________

10. A siren emitting sound of frequency 800Hz is going away from a static listener with a speed of 30m/s. Frequency of the sound to be heard by the listener is (Take velocity of sound as 330m/s).