Sound TY

SOUND CANNOT TRAVEL IN:

• SOLID

• GAS

• VACUUM

• LIQUID

When sound travels in form of a wave

• the particles of medium move from the source to the listener

• the particles of medium remain stationary

• the particles of medium transfer energy without leaving their mean positions

• the particles of medium start vibrating up and down

Unit of loudness

• decibel

• Decibel

• dB

• Db

S.I Unit of frequency

• Hertz

• hertz

• meter

• second

SI Unit of amplitude

• meter

• second

• centimeter

• hertz

Letter DENOTED FOR wavelength

• lambda

• WL

• METER

• NONE OF THE ABOVE

When sound propagates in air ,it does not carry energy with it

• TRUE

• FALSE

The pitch of sound depends on frequency

• TRUE

• FALSE

The safe limit of loudness of audible sound is:

• 0-80 dB

• ABOVE 80 dB

• 120 dB

• ABOVE 120 dB

In a piano , pitch is decreased by:

• increasing tension

• using thicker string

• striking it hard