Light And Sound

Question 1

Refraction

Answer 1

The bending of light waves when they slow down in a new medium.

Question 2

Plane mirror

Answer 2

A plane mirror is a flat and reflective surface which reflects light in one straight line.

Question 3

Cornea

Answer 3

The cornea is the transparent outer part of the eye.

Question 4

Oscillation

Answer 4

Oscillation is were it moves energy but not a medium.

Question 5

Speed of sound

Answer 5

Sound travels at 340m/s in air sound travels much faster in liquids, it can travel at 1500 m/s. Sound travels faster through a solid. In metals like steel it can travel at 5000 m/s.

Question 6

Specular reflection

Answer 6

Specular reflection is when you see a reflection in a flat surface unlike the mirrors that make you look different sizes.

Question 7

Lens

Answer 7

A piece of glass that you look through to help improve your sight

Question 8

Pitch

Answer 8

The pitch determines how high or low a sound is.

Question 9

Audible range

Answer 9

The audible range is how high and low an animal can hear. We can hear 20Hz - 20000Hz.

Question 10

Diffuse scattering

Answer 10

Diffuse scattering is were a reflective object is not flat and light gets shone on it it goes in different directions.

Question 11

Retina

Answer 11

The retina is at the back of the eye and the light comes and refracts into each other when they reach the retina so you can see.

Question 12

Amplitude

Answer 12

Amplitude is the distance between the peak/crest or trough of a transverse wave to the normal.

Question 13

Vacuum

Answer 13

A vacuum is an air less space were sound cannot travel through.

Question 14

Law of reflection

Answer 14

Light waves reflect from surfaces. When waves reflect, they obey the law of reflection: the angle of incidence equals the angle of reflection. The normal is a line drawn at right angles to the reflector. The angle of incidence is between the incident (incoming) ray and the normal.

Question 15

Convex lens

Answer 15

A convex lens is made from a transparent material that bulges outwards in the middle on both sides. It can focus light so that appears to meet at a single point, called the focal point. Light is refracted as it passes into, then out of, the lens.

Question 16

Frequency

Answer 16

the frequency is the number of waves per second – the higher the frequency, the closer together the waves are and the higher the pitch

Question 17

Ultrasound

Answer 17

Ultra sound is sound above 20000Hz

Question 18

Incident ray

Answer 18

A ray of light created on purpose.

Question 19

Concave lens

Answer 19

Someone with short-sightedness can see near objects clearly, but cannot focus properly on distant objects. This is caused by the eyeball being elongated, so that the distance between the lens and the retina is too great. It can be corrected by placing a concave lens in front of the eye.

Question 20

Wave length

Answer 20

The wavelength is the length of one point on a wave the same point on the next wave

Question 21

Echo

Answer 21

An echo is reflected sound

Question 22

Reflected ray

Answer 22

Reflected ray is when a incident ray hits a reflective object and reflects

Question 23

Dispersion

Answer 23

Light is refracted when it enters the prism, and each colour is refracted by a different amount. This means that the light leaving the prism is spread out into its different colours, a process called dispersion.

Question 24

Transverse wave

Answer 24

transverse waves are waves that look like a wave at sea. It moves in a straight line but it wiggles so it becomes bumpy

Question 25

Reverberation

Answer 25

Reverberation is something that creates the echo that we hear.

Question 26

Spectrum

Answer 26

Here are the seven colours of the spectrum listed in order of their frequency, from the lowest frequency (fewest waves per second) to the highest frequency (most waves per second):
red, orange, yellow, green, blue, indigo, violet
This mnemonic is one way to remember the order: ‘Richard Of York Gave Battle In Vain’.

Question 27

Angle of refraction

Answer 27

The angle of refraction is smaller than the angle of incident.

Question 28

Wave

Answer 28

A wave is something that carries energy but it can’t carry a medium

Question 29

Medium

Answer 29

A medium is a solid, liquid or gas

Question 30

Longitudinal wave

Answer 30

A longitudinal wave is a wave that goes in a straight line and vibrates to move so it cannot move outside a vacuum.

Question 31

Peak/ crest

Answer 31

The top of a transverse wave

Question 32

Trough

Answer 32

The bottom of a transverse wave

Question 33

Speed of light

Answer 33

The speed of light is how fast light travels. The speed of light is 300000k/s