51. Speed of sound is the greatest in
52. Which of the following statements about the speed of sound in different mediums is/are true at 25°C?
A. Speed of sound in steel is 5960 m/s.
B. The speed of sound in nickel is 6240 m/s.
A. Speed of sound in steel is 5960 m/s.
B. The speed of sound in nickel is 6240 m/s.
53. What are the sound waves in the air-
54. Which one of the following waves is used for detecting forgery in currency notes?
55. Sound travels fastest in which of the following mediums?
56. Compared to audible sound waves, ultrasound waves have
57. The time period of a second pendulum is
58. The device that uses ultrasonic waves to measure the distance, direction and speed of underwater objects is called:
59. Speed of sound is maximum in . . . . . . . .
60. Transverse waves can propagate
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