Sound Test

Result

Sound Test - 13

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Weekly Quiz Competition

Question 1
1 / -0

The distance between two consecutive crests of a wave is known as

A
spectrum

B
amplitude

C
frequency

D
wavelength

Solution

Wavelength is defined as the distance between two consecutive crests or troughs of a wave. The dimensions of wavelength are the same as that of distance.

The correct answer is D.

Why alternative A is wrong:

Spectrum is the plot of different frequencies of an electromagnetic wave. Hence, this alternative is incorrect.

Why alternative B is wrong:

Amplitude is the maximum displacement of a particle from its mean position in a wave. Hence, this alternative is incorrect.

Why alternative C is wrong:

Frequency is the time taken by a particle in a wave to complete one oscillation about its mean position. Hence, this alternative is incorrect.
Question 2
1 / -0

Use the following information to answer the next question.

A sound wave of frequency 750 Hz has a wavelength of 2 m in water at 20°C.

What is the speed of sound in water at 20°C?

A
375 m/s

B
750 m/s

C
1,500 m/s

D
7,500 m/s

Solution

This simple problem can be solved by knowing that the wavelength and the frequency of a wave are related as

c = νλ

Where λ = Wavelength of a wave = 2 m

ν = Frequency of a wave = 750 Hz

c = Speed of sound in water = (750 × 2) = 1,500 m/s

The correct answer is C.