41. Vibration of which among the following produces only odd harmonics?
42. A sound wave has a frequency of 3.5 kHz and its wavelength is 0.1 m. So how much time required to cover a distance of 700 meters?
43. Diffraction effect are more easily defected in case of a sound wave than light waves because
44. In which medium, velocity of sound is maximum?
45. Statement I Sound waves can travel through vacuum.
Statement II Light is an electromagnetic wave and can travel through vacuum.
Statement II Light is an electromagnetic wave and can travel through vacuum.
46. If the frequency of a sound wave is increased at a given velocity, what is the effect on its wavelength?
47. What is the frequency of the wave if the time interval of the vibrating object is 0.04 seconds?
48. The frequency of an ultrasonic sound wave is greater than . . . . . . . .
49. In case of a forced vibration, the resonance wave becames very sharp when the
50. Among the following materials, sound travels fastest in
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