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CBSE Notes 2011-2012 » IX-Science-Term2

Sound

Sounds having frequency more than 20 Hz are called

Multiple choice question

Sounds having frequency more than 20 Hz are called

Hertz is the unit of

Multiple choice question

Hertz is the unit of

Loudness of sound is expressed in

Multiple choice question

Loudness of sound is expressed in

Sound can propagate

Multiple choice question

Sound can propagate

When lightning and thunder take place, they

Multiple choice question

When lightning and thunder take place, they

The maximum displacement of a vibrating body on either side of its mean position, is known as its

Multiple choice question

The maximum displacement of a vibrating body on either side of its mean position, is known as its

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