waves and sounds physics

physics,sounds and waves,9th std,foundation

Wave speed

is the rate at which a wave crest or disturbance travels through a medium.

A tuning fork

is a U-shaped metal bar (steel or aluminium) with a stem; its two sides are called prongs or tines.

(It produces a specific pitch when struck)

Sound propagates (travels) from source to ear through a medium — the material through which sound travels. The medium can be

solid,liquid or gas

time period formula

T=1/f

vacuum is?

A vacuum is a space with no matter in it. Sound cannot propagate in vacuum

Wavelength

Distance between two consecutive crests or two consecutive troughs

Distance between two consecutive crests or two consecutive troughs

wavelength

Frequency

hertz (Hz) Number of density oscillations at a fixed point per unit time

hertz (Hz) Number of density oscillations at a fixed point per unit time

frequency

Time period

second (s) Time taken for one complete density oscillation at a fixed point

second (s) Time taken for one complete density oscillation at a fixed point

time period

Humans hear a limited band called the audible range:

20,000 Hz (20 kHz). The range varies from person to person and shrinks with age

hiiiii i ran out of ideas :0

bye have fun studying :(

Below twenty is infrasonic (infra = below); above twenty thousand is ultrasonic (ultra = beyond).which animals can hear respectively?

We hear neither but some animals do: dogs,bats respectively

Amplitude

is the maximum change in density of the air in a compression (or rarefaction) compared to the average density

Loudness is commonly reported in decibels (dB): rustling leaves are a few dB

normal conversation is about 60 dB