Activate 1 - Chapter P2 & 3 - Waves

Question 1

Refraction

Answer 1

The bending of light waves when it slows down from another medium.

Question 2

Plane Mirror

Answer 2

It is a mirror with a flat and reflective surface.

Question 3

Specular Reflection

Answer 3

It is a reflection from a smooth surface.

Question 4

Diffuse scattering

Answer 4

It’s a reflection from a rough surface.

Question 5

Law of reflection

Answer 5

The angle of incidence is equal to the angle of reflection.

Question 6

Incident Ray

Answer 6

A ray coming out of a source of light.

Question 7

Reflected ray

Answer 7

The ray that is reflected from a surface.

Question 8

Angle of refraction

Answer 8

The angle of refraction is the angle that shows how much the light has bent going through an object.

Question 9

Medium

Answer 9

The object that affects light or sound by slowing it down or transferring from the wave.

Question 10

Cornea

Answer 10

The transparent layer at the front of the eye.

Question 11

Lens

Answer 11

A device made of shaped glass that focuses light rays from objects to form an image.

Question 12

Retina

Answer 12

The layer of light sensitive cells at the back of the eye.

Question 13

Convex Lens

Answer 13

A lens that produces converging rays of light.

Question 14

Concave Lens

Answer 14

A lens that produces diverging rays of light.

Question 15

Dispersion

Answer 15

The splitting up of a ray of light of mixed wavelengths by refraction into its components.

Question 16

Spectrum

Answer 16

A band of colours produced when light is spread out by a prism.

Question 17

Wave

Answer 17

A vibration that transfers energy.

Question 18

Peak/Crest/Trough

Answer 18

Peak and Crest: Top of a wave

Trough: Bottom of a wave

Question 19

Oscillating

Answer 19

Oscillating is a different word for vibration.

Question 20

Pitch

Answer 20

A property of sound determined by its frequency.

Question 21

Amplitude

Answer 21

The distance from the middle to the top or bottom of a wave

Question 22

Frequency

Answer 22

The number of complete waves or vibrations produced in one second (measured in hertz).

Question 23

Wave Length

Answer 23

The distance between two identical points on a wave.

Question 24

Transverse Wave

Answer 24

The vibrations at right angles to the directions the wave moves.

Question 25

Longitudinal Waves

Answer 25

A wave where the vibrations are in the same direction as the direction the wave moves.

Question 26

Speed of light

Answer 26

The distance light travels in one second (300 million m/s).

Question 27

Speed of sound

Answer 27

The distance sound travels in one second (330m/s).

Question 28

Audible Range

Answer 28

The range of frequencies that you can hear.

Question 29

Vacuum

Answer 29

A space in which there is no matter.

Question 30

Ultrasound

Answer 30

Sound at a frequency greater than 20 000 Hz, beyond the range of human hearing.

Question 31

Echo

Answer 31

A reflection of a sound wave by an object.

Question 32

Reverberation

Answer 32

The persistence of a sound for a longer period than normal.

Question 33

Loudness

Answer 33

How loud you perceive a sound of a curtain intensity to be.

Question 34

Microphone

Answer 34

A device for converting sound into an electrical signal.

Question 35

Oscilloscope

Answer 35

A device that enables you to see electric symbols , like those made by a microphone.

Question 36

Hertz

Answer 36

The unit of frequency (Hz).

Question 37

Kilohertz

Answer 37

1 kilohertz (kHz) = 1000 hertz (Hz).

Question 38

Infrasound

Answer 38

Sound below a frequency of 20 Hz.

Question 39

Ear

Answer 39

The organ in your body that detects sound.

Question 40

Pinna

Answer 40

The outside part of the ear that we can see.

Question 41

Auditory Canal

Answer 41

The passage in the ear from the outer ear to the eardrum (Tympanic Membrane).

Question 42

Eardrum (Tympanic Membrane)

Answer 42

A membrane that transmits sound vibrations from the outer ear to the middle ear.

Question 43

Outer Ear

Answer 43

The pinna, auditory canal and eardrum (tympanic membrane)

Question 44

Ossicles

Answer 44

The small bones of the middle ear (hammer, anvil and stirrup) that transfers vibrations from the eardrum to the oval window.

Question 45

Middle Ear

Answer 45

The ossicles (small bones) that transfer vibrations from the outer ear to the inner ear.

Question 46

Amplify

Answer 46

To increase the amplitude of a sound so that it sounds louder.

Question 47

Oval Window

Answer 47

The membrane that connects the ossicles to the cochlea.

Question 48

Auditory Nerve

Answer 48

An electrical signal travels along the auditory nerve to the brain.

Question 49

Inner Ear

Answer 49

The semi circular