Jawaban:

a True

b True

c True

d False

e True

f False

g True

Alasannya:

a Sound is produced through vibrations from sound sources such as musical instruments, voices, and machines.

b Sound travels by vibrating molecules in the air, causing a chain reaction that carries the sound from the source to our ears.

c The frequency of a sound is the number of complete cycles of a sound wave per second.

d Generally, a sound with a higher frequency can appear to be louder than one with a lower frequency, but this is because the higher frequency sound has more energy.

e Sound can travel through solids, liquids, and gases because it is a mechanical wave which needs a medium such as these to travel through.

f Sound cannot travel through a vacuum, because there are no molecules to vibrate and propagate the sound waves.

g When sound waves travel down the ear canal they push on the cochlea, which then produces electrical signals that are sent to the brain and interpreted as sound.