21. The persistence of sound in an auditorium is the result of repeated reflections of sound and is called . . . . . . . .
22. The tolerable limit of noise for human being is around
23. Ultrasonic waves of frequency 3 × 105 Hz are passed through a medium, where speed of sound is 10 times that in air (speed of sound in air is 300 m/s). The wavelength of this wave in that medium will be of the order of
24. Consider the following statements.
1. A flute of smaller length produces waves of lower frequency.
2. Sound travels in rocks in the form of longitudinal elastic waves only.
Which of the statements given above is/are correct?
1. A flute of smaller length produces waves of lower frequency.
2. Sound travels in rocks in the form of longitudinal elastic waves only.
Which of the statements given above is/are correct?
25. A bomb explodes on the moon. You will heard its sound on earth after . . . . . . . .
26. The frequency of ultrasound wave is typically
27. The loudness of sound depends upon the
28. Speeds greater than the speed of sound in air are known as . . . . . . . .
29. Which one of the following statement(s) is/are not correct?
30. The word radar is derived from?
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