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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

A given sound is inaudible to the human ear if

Multiple choice question

A given sound is inaudible to the human ear if

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

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