(B) The pitch of a sound depends on the frequency of the vibration. Since the same key is struck,the frequency remains constant,and therefore the pitc

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sound will be louder but pitch will not be different

(B) The pitch of a sound depends on the frequency of the vibration. Since the same key is struck,the frequency remains constant,and therefore the pitch does not change.Loudness depends on the amplitude of the vibration. When the key is struck harder,the amplitude of the vibration increases,which results in a louder sound.

Class 9 Science SOUND Mix Example - SOUND

Medium

$A$ key of a mechanical piano is struck gently and then struck again but much harder this time. In the second case,

A
sound will be louder and pitch will also be higher
B
sound will be louder but pitch will not be different
C
sound will be louder but pitch will be lower
D
both loudness and pitch will remain unaffected

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Class 9 Questions

Class 9

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SOUND

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Mix Example - SOUND

$A$ note is a sound:

Easy

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Why can we hear echoes in long galleries and big halls?

Easy

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$(i)$ How do bats make use of ultrasonic waves to catch their prey? Explain.
$(ii)$ $A$ radar signal is reflected by an aeroplane and is received $2 \times 10^{-5} \text{ s}$ after it was sent. If the speed of these waves is $3 \times 10^{8} \text{ m s}^{-1}$,how far is the aeroplane?

Medium

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Flash of lightning reaches earlier than the sound of thunder. Why?

Easy

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$(a)$ Illustrate the use of a stethoscope.
$(b)$ What are infrasonic and ultrasonic sound waves?

Medium

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$A$ key of a mechanical piano is struck gently and then struck again but much harder this time. In the second case,

Similar Questions

$A$ note is a sound:

Why can we hear echoes in long galleries and big halls?

$(i)$ How do bats make use of ultrasonic waves to catch their prey? Explain.$(ii)$ $A$ radar signal is reflected by an aeroplane and is received $2 \times 10^{-5} \text{ s}$ after it was sent. If the speed of these waves is $3 \times 10^{8} \text{ m s}^{-1}$,how far is the aeroplane?

Flash of lightning reaches earlier than the sound of thunder. Why?

$(a)$ Illustrate the use of a stethoscope.$(b)$ What are infrasonic and ultrasonic sound waves?

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$(i)$ How do bats make use of ultrasonic waves to catch their prey? Explain.
$(ii)$ $A$ radar signal is reflected by an aeroplane and is received $2 \times 10^{-5} \text{ s}$ after it was sent. If the speed of these waves is $3 \times 10^{8} \text{ m s}^{-1}$,how far is the aeroplane?

$(a)$ Illustrate the use of a stethoscope.
$(b)$ What are infrasonic and ultrasonic sound waves?