sound wave Flashcards
how is sound transmitted and what can affect it?
sound travels. when vibrations of atoms are passed on to neighbouring atoms. speed of sound is affected by stiffness and density.
which state does sound travel fastest in?
speed of sound in solid > speed of sound in liquid > speed of sound in gas
does higher frequency affect the speed of sound?
no. sounds of higher frequency does not travel faster.
what is a sound level meter?
device that gives an objective number indicating loudness. It gives a standardised reading when exposed to sound of same amplitude.
does amplitude affect the loudness?
larger the amplitude, louder the sound
what is pitch?
humans perception of sound
what is the audible range of a normal human?
20Hz to 20000Hz
what is echo?
echo is the reflected sound
what is the application of sounds? (bats)
bats uses echoes to locate objects and preys.
what is the application of sounds (Sonar technologies)
it emits sound pulse into the water and listens for reflected pulse. reflected pulse comes from the shoal of fishes. The strength of reflected pulse depends on how far the fishes are. After the reflected signals are processed by computer, fisherman’s can determine the location of the fishes.
what are the application of sound (reverse sensors of cars)
the sensor installed at the back of the car uses echolocation to detect obstacles. As the reversing car gets closer to an obstacle, the sensors beeps faster to warn the driver.
