Sound Revision Quiz Form 2-Ms Karen Bugeja

If the frequency increases, what will happen? You can tick more than one box.

Label the marked spots on the diagram below

Label the picture below

What will you HEAR differently if the wavelength increases?

The frequency limit of a human is between [blank_start]20[blank_end] and [blank_start]20000[blank_end] Hz

Echoes are:

This wave is [blank_start]3[blank_end] Hz because it has [blank_start]3[blank_end] waves in [blank_start]1[blank_end] second (write in numbers not letters)

The wavelength is the vertical distance from the equilibrium (middle)

Sound travels when the molecules in the [blank_start]medium[blank_end] vibrates. The closer the molecules are, the [blank_start]faster[blank_end] sound travels. The fastest medium is a [blank_start]solid[blank_end] while sound does not travel in a [blank_start]vacuum[blank_end]. In the ear, a vibrating object e.g. a trumpet produces waves. Sound then travels from the [blank_start]medium[blank_end] (air) to the ear. The vibrating air enters the ear, fuelled to the [blank_start]ear canal[blank_end]. The vibrating air sets up vibrations in the [blank_start]ear drums[blank_end]. The ear drums then transmit the vibrations to the small bones called [blank_start]ossicles[blank_end], causing them to vibrate. The [blank_start]cochlea[blank_end] vibrates. These vibrations are detected by the hair lining and the [blank_start]auditory nerve[blank_end] will then detect these vibrations and send the impulses to the brain.

An echo sounder ship is tested where the sea bed is known to be 60 m deep. The time between sending each ultrasonic pulse and receiving its echo was measured at 0.1s. The time for the ultrasonic wave to reach the sea bed is [blank_start]0.05[blank_end] s. To find the speed, we have to use the equation speed = distance/time, so [blank_start]60[blank_end] division by [blank_start]0.05[blank_end]= [blank_start]1200[blank_end] m/s.