Question

A sound wave travels at a speed of 336m/s. If the wavelength is 1.5cm ; what is the frequency of the wave? Will it be audible to human beings?​

Answer 1

Answer:

Speed  ⇒ 336 m/s

Wavelength ⇒ 1.5 cm  

now change it to metre

           ⇒ 1.5 / 100

           ⇒ 0.015 m  

   Speed = Wavelength x Frequency

⇒ 336 m/s  = 0.015m x Frequency

⇒ Frequency = 336 m/s / 0.015m

                     

                     = 22400 Hz.

It is more than 20000 Hz. Therefore, it will not be audible to the human ear.

Explanation:

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Answer 2

Answer:

i) 22,400 Hz

ii) No

Explanation:

Given:

• Speed of sound wave (V) = 336 m/s

• Wavelength of sound wave (λ) = 1.5 cm = 0.015 m

To find:

• Frequency of the wave (f)

Method to find:

V = fλ

⇒ 336 = 0.015 * f

⇒ f = 336/0.015

⇒ f = 22,400 Hz

Range of human hear = 20 Hz to 20,000 Hz

So, this sound will not be audible to human ears, as it is ultrasonic (above 20,000 Hz).

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