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Grade 8 CBSE
› Sound Worksheet-5
Name the organs in human which receives sound.
What is outer part of ear called?
What is ear drum?
What is oscillatory motion?
What do you mean by frequency?
Write the unit of frequency.
What are the two main properties of a sound which help us to recognize sound?
Define time period.
On which factor loudness of sound depend?
What is pitch or shrillness of a sound?
What is the hearing range of human ears?
What are frequencies of sound which are inaudible?
How does the amplitude affect the loudness of vibrations?
Why the sound of a baby is feeble?
What frequencies are heard by dogs and cats?
What is ultrasound?
What is noise?
What do you mean by musical sound?
Give examples of noise and musical sound.
The outer part of the ear is called pinna. It is funnel shaped.
A thin and stretched membrane is called ear drum.
The vibratory motion is also called oscillatory motion.
The number of oscillations in one second is called frequency.
The unit of frequency is hertz.
A frequency of one hertz is one oscillation per second.
Amplitude and frequency.
The time taken by a vibrating body to complete one oscillation is called time period.
The characteristic of sound which depends on its frequency is called pitch of a sound.
Hearing range of human ears is 20 H
to 20,000 H
Less than 20 H
and more than 20,000 H
Higher is the amplitude, louder is the voice.
The sound of a baby is feeble due to its small amplitude.
The dogs can hear up to 40,000 H
frequencies while cats can hear up to 70,000 H
The sound having frequency more than 20,000 H
is called ultrasound.
The loud sound which produces unpleasant sensation is called noise.
The sound which produces pleasant sensation is called musical sound.
The sound in classroom is noise while sound of any musical instrument is musical sound.
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