11. The optimum sound level for human beings is
12. In which type of waves do vibrations move parallel to the direction of the wave's movement?
13. If the frequency of a wave is doubled then its wavelength will be-
14. What is the approximate minimum distance between source and reflector for echo?
15. Ultrasonic waves are produced by making use of
16. The walls of the ball, built for music concerts should
17. Consider the following statements about ultrasonic waves.
1. They can destroy insects.
2. They can clean clothes by removing dust.
3. They can be used to treat diseases.
4. They can control automatic doors.
Of the above statements.
1. They can destroy insects.
2. They can clean clothes by removing dust.
3. They can be used to treat diseases.
4. They can control automatic doors.
Of the above statements.
18. The frequency which is not audible to the human ear is:
19. Which of the following is/are true regarding speed of sound in different mediums at 25°C?
A. In aluminium, the speed of sound is 6220m/s.
B. In nickel, the speed of sound is 6040 m/s.
A. In aluminium, the speed of sound is 6220m/s.
B. In nickel, the speed of sound is 6040 m/s.
20. The way the brain interprets the frequency of an emitted sound is called the . . . . . . . .
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