Question

Calculate the frequency (in Hz) of a sound wave of wavelength 5 m travelling with a speed of 360 m/s.
A) 1800 B) 36 C) 900 D) 72

Answer 1

Answer:

(D) 72 hertz

Explanation:

Given :

• Wavelength of the sound wave = λ = 5 metres

• Speed of the sound = 360 m/s

To find :

• Frequency of the sound wave

Wavelength = speed of the sound / frequency

5 = 360/frequency

5×frequency = 360

Frequency = 360/5 = 72 hertz

The frequency of the sound wave is equal to 72 hertz

Option (D) is hence correct for the above question

Answer 2

Answer :

Given that wave of wavelength 5 m travelling with a speed of 360 m/s .

We have to find frequency (in Hz) . A) 1800. B) 36. C) 900. D) 72

From data we have :

Wavelength, λ = 5 m

Speed = 360 m/s

Frequency = ?

We know that,

→ Wavelength = Speed/Frequency [λ = v/f]

Substituting values,

→ 5 = 360/Frequency

→ 5 × Frequency = 360

→ Frequency = 360/5

→ Frequency = 72 Hz

Therefore,

∴ Frequency of the sound wave = 72 Hz

Correct answer = D) 72