A person has a hearing range from 20 Hz to 20 KHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 ms

Question:

A person has a hearing range from 20 Hz to 20 KHz. What are the typical wavelengths of sound waves in air corresponding to these two frequencies? Take the speed of sound in air as 344 ms^–1?

Answer:

Speed of sound in air v = 344 ms^–1

Frequency v = 20 Hz

Wavelength λ = ?

From, Velocity = wavelength × frequency

344 ms^–1= λ× 20 Hz

λ = 344 ms^–1 / 20 Hz

λ = 17.2 m

λ = 17.2 m / 1000

[For v = 20 KHz or 20000 Hz]

λ = 0.0172 m

‍

This is, the wavelengths of sound corresponding to the range from 20 Hz to 20 KHz are 17.2m and 0.0172m respectively.

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Chapter 11 NCERT Class 9 Science SOLUTIONS

Question:

Answer:

More NCERT Questions

Explain how defects in a metal block can be defected using ultrasound?

How is ultrasound used for cleaning?

What is loudness of sound? What factors does it depend on?

What is reverberation? How can it be reduced?

A sound wave travels at a speed of 339 ms–1. If it’s wavelength is 1.5 cm, what is the frequency of the wave? Will it be audible?

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Chapter 11 NCERT Class 9 Science SOLUTIONS

Question:

Answer:

More NCERT Questions

Explain how defects in a metal block can be defected using ultrasound?

How is ultrasound used for cleaning?

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Give two practical applications of reflection of sound waves?

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Does sound follow the same laws of reflection as light does? Explain.

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Two children are at opposite ends of an aluminum rod. One strikes the end of the rod with a stone. Find the ratio of times taken by the sound wave in air and in aluminum to reach the second child.

Flash and Thunder are produced simultaneously. But thunder is heard a few seconds after the flash is seen. Why?

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