In what range of pressure can a sound be heard by human.

What is pressure ?

Sound waves of wavelength1cm have a velocity of 340 m/s in air. What is their frequency? Can this sound be heard by the human ear?

Complete the paragraph Complete the following paragraph by choosing correct alternatives from those given in the bracket. (audible, 20 Hz, infra-sound, greater, 20,000 Hz, electrical signals, less, pressure) Range of frequencies of sound which can be heard by the human ears is called ________sound. The range of audible sound is between_________to __________to . Sound of frequency less than 20 Hz is called ______Ultra sound has a frequency ______than 20,000 Hz. Human ear converts pressure variations in air into_________.

Consider two cases (A) whistle of train (B) roar of a lion Three sounds 5 Hz, 500 Hz and 50,00 Hz are procued by different sources. Which sound will be heard by humans?

What are pressure node and pressure antinode ?

The range of an ammeter can be increased by

The range of a voltmeter can be increased by

Explain the effect of change in pressure on speed of sound in air at constant temperature.

A passenger is sitting in a fast moving train The engine of the train below a whistle of frequency 'n' .If the apparent frequency of sound heard by the passenger is 'n' then

A passenger is sitting in a fast moving train. The engine of the train blows a whistle of frequency ‘n\ If the apparent frequency of sound heard by the passenger is n', then