Sound Keywords

Question 1

Vibrate

Answer 1

Movement back and forth- vibrations are sometimes referred to as oscillations.

Question 2

Longitudinal wave

Answer 2

A wave where the vibrations are parallel to the direction of energy transfer

Question 3

Decibel (dB)

Answer 3

A unit of sound loudness.

Question 4

Amplitude

Answer 4

The maximum displacement of a point on a wave from the undisturbed equilibrium position.

Question 5

Frequency

Answer 5

The number of waves passing a set point, or emitted by a source, in a second- frequency is measured in Hertz (Hz or /s)

Question 6

Waveform

Answer 6

A graph of the displacement of wave motion on different distances along the wave.

Question 7

Wavelength

Answer 7

The distance between two identical points on consecutive waves- e.g., the distance between one crest to the next or one trough to the next.

Question 8

Microphone

Answer 8

A device for changing sound into an electrical signal

Question 9

Reflection

Answer 9

When a wave, such as light, bounces off a surface

Question 10

Echo

Answer 10

The effect of hearing a sound twice, once when it is created and the second time after the sound wave has undergone reflection, before being heard.

Question 11

Speed of sound

Answer 11

The speed at which a sound wave travels

Question 12

Wave speed

Answer 12

The speed at which a wave travels. Waves speed (m/s) = wavelength (m) x frequency (Hz)

Question 13

Sonar

Answer 13

A technique used to measure distance by detecting reflected ultrasound waves.

Question 14

Particle

Answer 14

A very small part of a material such as an atom or a molecule.

Question 15

Vacuum

Answer 15

A space where there are no particles of matter.

Question 16

Hypothesis

Answer 16

An idea that explains facts or observations and is the basis for experimentation (X depends on Y)

Question 17

Reflect

Answer 17

To redirect a wave such as sound or light

Question 18

Absorb

Answer 18

To take in energy e.g, from sound.

Question 19

Soundproofing

Answer 19

Using materials that absorb sound

Question 20

Ear canal

Answer 20

Where sound waves enter the ear

Question 21

Ear drum

Answer 21

The membrane in the ear that transfers energy from sound waves to the inner ear.

Question 22

Ossicles

Answer 22

Tiny bones in the ear that amplify the vibrations of sound.

Question 23

Cochlea

Answer 23

Part of the inner ear where vibrations are changed to electrical signals

Question 24

Auditory nerve

Answer 24

The nerve that transmits signals from the ear to the brain.

Question 25

Loudness

Answer 25

A measure of the energy in a sound wave recorded in decibels (dB)

Question 26

Ears defenders

Answer 26

Protection worn for the ears to protect them from loud sounds.

Question 27

Hearing range

Answer 27

The range of sound frequencies than an animal can hear