51. Which of the following sound wave will have the longest wavelength?
52. Which of the following statements about the speed of sound in different mediums is true/false at 25°C?
A. In seawater, the speed of sound is 1531 m/s.
B. In water (distilled), the speed of sound is 1498 m/s.
A. In seawater, the speed of sound is 1531 m/s.
B. In water (distilled), the speed of sound is 1498 m/s.
53. An object travelling at a speed greater than the speed of sound in air is called . . . . . . . .
54. The amplitude of the wave is-
55. Which of the following is the time taken for a complete oscillation of a sound wave in the density of the medium?
56. . . . . . . . . determines the speed of sound in a medium.
57. Which of the following is not electromagnetic wave?
58. Sound above what level (in decibel) is considered hazardous noise pollution?
59. Match List I (Electromagnetic Wave) with List II (Discoverer) and select the correct answer:
List-I
List-II
a. Infrared waves
1. Ritter
b. Ultraviolet rays
2. Newton
c. X-rays
3. Herchel
d. Visible rays
4. W Roentgen
| List-I | List-II |
| a. Infrared waves | 1. Ritter |
| b. Ultraviolet rays | 2. Newton |
| c. X-rays | 3. Herchel |
| d. Visible rays | 4. W Roentgen |
60. A human being cannot tolerate very loud sound. What is the level of loudness which a human being can tolerate?
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