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.

54.
The amplitude of the wave is-

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

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