Sound And Light

Question 1

Plane mirror

Answer 1

A flat mirror that allows you to see reflections and reflects light in a way called specular reflection.

Question 2

Refraction

Answer 2

The light rays when bend because they slow down or speed up. This happens when it enters a new medium.

Question 3

Specular reflection

Answer 3

The perfect reflection of light- the angle of incidence is equal to the angle of reflection. If you can see your reflection in an object, it allows specular reflection.

Question 4

Speed of sound

Answer 4

The speed of sound varies with each medium, but is 330 m/s through air.

Question 5

Audible range

Answer 5

The human audible range is 20Hz to 20KHz. When we get older, we can not hear the higher pitched noises.

Question 6

Diffuse scattering

Answer 6

This is when light travels into a rough surface. It bounces everywhere and the angle of incidence and reflection usually have no links. You can’t see you reflection in objects that cause this.

Question 7

Incident ray

Answer 7

The light ray that travels directly into an object.

Question 8

Law of reflection

Answer 8

With specular reflection, the angle of incidence is equal to the angle of reflection.

Question 9

Vacuum

Answer 9

Where there is no matter. Longitudinal waves can’t pass through vacuums.

Question 10

Pitch

Answer 10

This is how high or low a sound is. A higher frequency means a higher pitch.

Question 11

Amplitude

Answer 11

How the distance between the equilibrium and the top of the wave. In sound, a higher amplitude is louder.

Question 12

Frequency

Answer 12

How quickly a wave is emitted. A high frequency would mean a high pitched sound.

Question 13

Ultrasound

Answer 13

An inaudible sound to humans. It is above 20KHz

Question 14

Echo

Answer 14

When sound passes by someone and bounces back to them. This makes the person hear that noice many times.

Question 15

Speed of light

Answer 15

Just under 1000 times faster than sound at 3000000 m/s.

Question 16

Transverse waves

Answer 16

Oscillations that are at a 90 degree angle to the direction of energy transfer. They travel in straight lines and can travel through vacuums. They transfer energy, not matter.

Question 17

Oscillation

Answer 17

An oscillation is a wave. One oscillation in a transverse wave is one wavelength.

Question 18

Peak/Crest and trough

Answer 18

The peak/crest is the top of a transverse wave while the trough is the bottom

Question 19

Medium

Answer 19

A medium is any type of matter that can allow a wave to travel.

Question 20

Wave length

Answer 20

The distance between a point on a wave and the same point on the next.

Question 21

Convex lens

Answer 21

A lens that goes out. In fixes long sighted people as it converges the light rays.

Question 22

Concave lens

Answer 22

A lens that comes inwards. It fixes short sighted people as it diverges the light rays.

Question 23

Reverberation

Answer 23

When a sound bounces of an object. This causes an echo.

Question 24

Longitudinal wave

Answer 24

A wave where the direction of energy transfer is parallel to the direction of travel. They require a medium to travel through and transfer energy, not matter.

Question 25

Reflected ray

Answer 25

The ray of light that bounces off an object.

Question 26

Refraction

Answer 26

Refraction happens when light bends. Light bends because it enters a new medium. It speeds up or slows down. This causes us to see things closer or further away than they really are.

Question 27

Angle of refraction.

Answer 27

The difference between the angle that light enters or exits a medium and the normal.

Question 28

Retina

Answer 28

The object in an eye that catches light and converts it into an electrical charge to be sent to the brain.

Question 29

Spectrum

Answer 29

The arrangement of colours together. A rainbow is a spectrum.

Question 30

Dispersion

Answer 30

Dispersion is the splitting of light into the spectrum.

Question 31

Wave

Answer 31

Something that travels in straight lines and transfers energy, not matter.

Question 32

Cornea

Answer 32

The tough protective layer outside the eye. It is convex.

Question 33

Lens

Answer 33

The lens is the object that focuses light onto the retina.