Sound and Light Quiz

describe how sound is produced and travels

• Objects vibrate, which generates sound waves which travel to your ear through the air

• waves are generated by water particles and travel into your ear

• longitudinal waves are formed by turning cups and they travel down string

explain why the speed of sound is different in different materials

• different materials vibrate at different frequencies

• different materials have different insulating properties

• different materials have different distances between atoms or molecules

contrast the speed of sound and the speed of light

• sound is faster than light

• light is faster than sound

• they are both the same speed

describe the link between pitch and frequency

• pitch is higher when the frequency is higher

• pitch is higher when frequency is lower

state the range of human hearing and describe how it differs from the range of hearing in animals

• human hearing range is 20 Hz to 20 kHz. dogs can hear a much bigger range of sounds

• Humans can hear all different frequencies of sound

• Whales and humans have the same hearing range

describe the amplitude of a wave

• height of the wave from the central zone

• height of the wave from the trough to peak

• width of one wave

• how many waves you have in 1s

describe the frequency of a wave

• height of the wave from the central zone

• height of the wave from the trough to peak

• width of one wave

• how many waves you have in 1s

describe the wavelength of a wave

• height of the wave from the central zone

• height of the wave from the trough to peak

• width of one wave

• how many waves you have in 1s

Explain how we hear sounds

• pinna of ear vibrates and send signal to brain to vibrate the small bones in the ear. this is interpreted as sounds by the cochlea.

• ear drum bursts and allows sounds into the inner ear for the brain to interpret a sounds

• Your outer ear directs sound waves to your eardrum and causes it to vibrate. These vibrations move through your middle ear and into your inner ear. Finally, these signals travel to your brain, which translates them into what you hear.

describe what ultrasound is.

• really high frequencies of sound above human hearing

• really low frequencies of sound below human hearing

• sound much louder than our ears can hear

• sounds too quiet for our ears to hear