Sound And Light Waves

Question 1

Refraction

Answer 1

The bending of light waves when they sound into a medium e.g air into water

Question 2

Specular Reflection

Answer 2

This is when something is reflected from a smooth surface

Question 3

Diffuse Scattering

Answer 3

Reflection from a rough surface

Question 4

Law of Reflection

Answer 4

When light is reflected from a mirror, the angle of incidence is equal to the angle of reflection.

Question 5

Plane mirror

Answer 5

A plane mirror is a flat mirror. When you look at a plain mirror, you see a reflected image of yourself.

Question 6

Medium

Answer 6

Either a solid, liquid or gas that helps sound travel.

Question 7

Incident ray

Answer 7

The ray that hits the mirror from your ray box is called an incident ray.

Question 8

Reflected ray

Answer 8

The ray that is reflected off the ray.

Question 9

The angle of refraction

Answer 9

The distance between the normal and the reflected ray.

Question 10

Cornea

Answer 10

The lens that focuses the light onto the retina

Question 11

Lens

Answer 11

The lens focuses the light and enables to you to see.

Question 12

Retina

Answer 12

This is when an image is formed. Light travels through the pupil of your eye into the retina

Question 13

Convex Lens

Answer 13

A convex lens converges light into your retina.

Question 14

Concave Lens

Answer 14

It diverges light onto the retina

Question 15

Dispersion

Answer 15

When white light passes through a prism and then different colours of the spectrum separate.

Question 16

Spectrum

Answer 16

This is when the light waves ( white light )are refracted in a triangular prism and then a rainbow of colours spreads out.

Question 17

Waves

Answer 17

A wave is an oscillation or vibration that transfers energy or information.

Question 18

Peak/Crest/trough

Answer 18

A peak or crest is the top of the wave. The bottom of a wave is called a trough.

Question 19

Oscillations

Answer 19

An oscillation is a vibration that transfers energy.

Question 20

Pitch

Answer 20

It shows how high or low a sound is.

Question 21

Amplitude

Answer 21

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

Question 22

Frequency

Answer 22

The numbers of waves that go pasta particular point per second.

Question 23

Wavelength

Answer 23

A wavelength is the distance from one point of a wave to the same point on the next wave.

Question 24

Transverse wave

Answer 24

This is when the oscillation is at 90 degrees to the direction of a wave.

Question 25

Longitudinal waves

Answer 25

This is when the oscillation is the same direction of the wave.

Question 26

Speed of light

Answer 26

The speed of light is 300 000 000 m/s

Question 27

Speed of Sound

Answer 27

The speed of sound is 349 m/s in air, 1500 m/s in liquids and 5000 m/s in a solid.

Question 28

Audible Range

Answer 28

A particular frequency of what you can hear. You have the biggest audible range when your young 20-20000 Hz. Your audible range changes as you get older. You will find it more difficult to hear high-frequency sounds.

Question 29

Vacuum

Answer 29

This when there are no air molecules to vibrate like space.

Question 30

Ultrasound

Answer 30

Ultrasound is sound with a high frequency above 20 000 Hz. Doctors use it to make images of unborn babies. Bats use it to find their food.

Question 31

Echo

Answer 31

When sound reflects off a surface it produces an echo. Sound takes time to travel. There os a time delay making a sound and hearing an echo.

Question 32

Reverberation

Answer 32

If lots of echos join together to produce a longer sound this is called reverberation. It can be annoying in concert halls or cinemas. You can reduce the noise by covering the walls with soft materials and putting carpets on the floor.