Sound Test

Result

Sound Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following characteristics of a wave changes with a change in its speed?

A
Frequency

B
Intensity

C
Amplitude

D
Wavelength

Solution

Wavelength is the distance between two consecutive crests or troughs. The distance between two consecutive crests or troughs decreases with the decrease in the speed of a wave. Therefore, the wavelength of a wave changes with a change in the speed of the wave.

The correct answer is D.
Why alternative A is wrong:

Frequency of the wave remains constant.
Why alternative B is wrong:

The intensity of a wave depends on its amplitude. It does not get affected by a change in the speed of the wave.

Why alternative C is wrong:

Amplitude is the maximum displacement of a wave from its mean position. A change in the speed of a wave does not affect its amplitude.

Question 2

1 / -0

Use the following information to answer the next question.

The frequencies of four different electromagnetic waves are given in the table.
Wave	Frequency (in Hz)
Radio	0⁷
Infrared	1
Ultraviolet	10¹⁴
Gamma	10¹⁵
	10²³

Which wave has the maximum wavelength?

Radio

Gamma

Infrared

Ultraviolet

Solution

The frequency of an electromagnetic wave is inversely proportional to its wavelength. This implies that the electromagnetic wave with the minimum frequency will have the maximum wavelength. Thus, radio waves have the maximum wavelength.

The correct answer is A.

Why alternatives B, C and D are wrong:

Since the wavelength of an electromagnetic wave is inversely proportional to its frequency, alternatives B, C, and D are incorrect.