Physics: Vision
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Physics: Vision
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25 Questions

1. A man is sitting by the side of a large lake. He hears the utterances of bathers with their mouth close to water surface more clearly than if they were at same distance away on land. This effect is due to sound waves undergoing
2. Sound produced at a point is heard by a person after 5 s, while the same sound is heard by another person after 6 s. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
3. A bomb explodes on the Moon. How long will it take for the sound to reach the Earth?
4. When a stone is dropped in a well a splash is heard after 1.5 s after the stone hits the water surface. If the velocity of sound is 327 m/s, the depth of the well is
5. The velocity of sound is maximum in
6. The velocity of sound is '
7. The wavelength used in radar is
8. Mach number is used in connection with the speed of
9. When a tuning fork produces sound waves in air, which one of the following is the same in the material of tuning fork as well as in air?
10. Sound waves in air are
11. Sound travels fastest in
12. Ability of the eye to see objects at all distances is called
13. Production of beats is a result of the phenomenon of
14. Sound travels with a different speed in different media. In what order does the velocity of sound increase in these media?
15. The pitch of sound is measured by its
16. When mechanical waves have a frequency below the audible range, these are called
17. A supersonic plane flies at the speed
18. What are ultrasonic waves?
19. In a doctor's stethoscope, sound is intensified because of
20. The intensity of sound at a point is ______ its distance from the source.
21. When a person walking in bright sunlight enters a dark room, he is not able to see clearly for a little while because
22. The quality of sound depends upon its
23. Bats can fly in the dark because
24. A tuning fork of frequency f resonates with the shortest column, l1 of a tube with one end closed and the other open and if the next higher resonant column is of length l2, then the velocity of sound is
25. Sound of frequency below 20 Hz are called

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