Physics - Waves

Question 1

What is a wave?

Answer 1

A wave transfers energy from one place to another without any transfer of matter

Question 2

How is a wave created?

Answer 2

Particles or electromagnetic fields vibrate through a medium

Question 3

What evidence is there that waves travel not matter?

Answer 3

Waves in water travels towards the land. The water doesn’t move onto land leaving an absence behind it

Question 4

What is a transverse wave?

Answer 4

The vibrations are perpendicular to the direction of motion ~~~~

Question 5

Which waves are transverse?

Answer 5

Water, Electromagnetic radiation and light

Question 6

What is a longitudinal wave?

Answer 6

The vibrations are parallel to the direction of motion ll ll ll ll

Question 7

Which waves are longitudinal??!

Answer 7

Sound

Question 8

What is compression?

Answer 8

When the particles are close together

Question 9

What is a rarefaction?

Answer 9

When the particles are far apart

Question 10

What is frequency?

Answer 10

The number of vibrations per second

Question 11

What is frequency measured in?

Answer 11

Hertz (Hz)

Question 12

What is time period?

Answer 12

The amount of time taken to pass a certain point

Question 13

What is time period measured in?

Answer 13

Seconds (s)

Question 14

What is amplitude?

Answer 14

The maximum displacement a wave can be from it’s rest position

Question 15

What is wavelength?

Answer 15

The distance from one point of a wave to the same point on the next. Peak-peak

Question 16

Equation for wave speed

Answer 16

Wave speed= Frequency x Wavelength

Question 17

What is wavespeed?

Answer 17

The speed at which energy is transferred through a medium

Question 18

What is diffuse reflection?

Answer 18

When parallel rays of light hit a rough surface and when they are reflected they are no longer parallel

Question 19

What is specular reflection?

Answer 19

When parallel rays of light hit a smooth surface and upon reflection remain parallel

Question 20

What is the law of reflection?

Answer 20

Angle of incidence = Angle of reflection

Question 21

What is a virtual image?

Answer 21

One which the light rays appear to have come from but don’t

Question 22

What is a real image?

Answer 22

One where light rays come from

Question 23

What is refraction?

Answer 23

The changing of speed of a wave as it enters a material with a different optical density. The wave changes direction

Question 24

What happens to parallel rays of light when they enter a convex lens?

Answer 24

They converge towards the focus

Question 25

How to draw a convex lens diagram?

Answer 25

1. Draw a line from the top of the object horizontally to the lens then through the focus 2. Draw a line from the top of the object through the middle of the lens 3. Where they connect is the top of the image

Question 26

Convex lens image appearance of over two focal lengths

Answer 26

Real, inverted, diminished

Question 27

Convex lens image appearance of between one and two focal lengths

Answer 27

Real, inverted, magnified

Question 28

Convex lens image appearance of one focal length

Answer 28

Image appears at infinity

Question 29

Convex lens image appearance of less than one focal length

Answer 29

Behind object, virtual, upright, magnified

Question 30

What happens to parallel rays of light when they enter a concave lens?

Answer 30

Rays diverge from the focal point which is on the same side of the lens as the object

Question 31

How to draw a concave lens diagram?

Answer 31

1. Line to the lens then dotted back to focus 2. Line through the middle of the lens from the top of object 3. Where they would meet is the top of the image

Question 32

What is the equation for magnification?

Answer 32

Magnification = Image size / Actual size

Question 33

What happens to white light shone through a prism?

Answer 33

It refracts and reveals the rainbow

Question 34

What is a filter?

Answer 34

A filter only allows certain wavelengths through