Waves

Question 1

What is the amplitude of the wave

Answer 1

Amplitude is the maximum displacement of a point on the wave from its undisturbed position

Question 2

Wavelength definition

Answer 2

Distance between the same point on two adjacent waves

Question 3

Frequency definition

Answer 3

Number of complete waves passing a certain point per minute. Measured in Hz. 1Hz=1 wave per second

Question 4

Period definition

Answer 4

The amount of time it takes for a cycle of the wave

Question 5

Two types of wave

Answer 5

Longitudinal and transverse

Question 6

Transverse wave qualities

Answer 6

Sideways rotation
Oscillations are perpendicular
All electromagnetic waves are transverse
A wave on a string

Question 7

Longitudinal wave qualities

Answer 7

Parallel rotation
Oscillations are parallel to the direction of energy transfer
Sound waves in air e.g ultrasound
Shock waves e.g some seismic waves

Question 8

Wave speed

Answer 8

Speed of which energy is being transferred(or the speed of the wave is moving at

Question 9

Law of reflection

Answer 9

All waves can be transmitted, absorbed or reflected

Question 10

What is the rule of reflected waves

Answer 10

Angle of incidence=angle of reflection

Question 11

What is specular diffusion

Answer 11

Happens when a wave is reflected in a simple direction by a smooth surface. E.g when a light is reflected by a mirror and you get a nice clear reflection

Question 12

What is diffuse reflectoion

Answer 12

When a wave is reflected by a rough surface(e.g a piece of paper)and the reflected rays are scattered in lots of different directions

Question 13

Refraction explanation

Answer 13

Waves changing direction at a boundary. When a wave crosses a boundary between materials at an angle it changes direction-its refracted

Question 14

What kind of current is used to generate radio waves in an antenna

Answer 14

Alternating current

Question 15

Explain why microwaves are used to generate radio waves in an antenna

Answer 15

They pass easily through the earths watery atmosphere

Question 16

Give three uses of infared radiation

Answer 16

Cooking food
House warming
Electrical heaters

Question 17

What type of radiation is used to generate optical fibre

Answer 17

Visible light

Question 18

Name the type of radiation used in tanning salons

Answer 18

Ultraviolet radiation

Question 19

What does the term ionising radiation mean

Answer 19

Carry enough to energy to knock electrons of atoms. This causes gene mutation or cell destruction and cancer

Question 20

What are the three rules for refraction in a convex lens

Answer 20

An incident ray parrellel to the axis refracts through the lens and passes through the principal focus on other side.
An incident ray passing through the principal focus refracts through the lens and travels parallel to the axis.
An incident ray passsing through the centre of the lens carries on in the same direction

Question 21

What are the rules for refraction in a concave lens

Answer 21

An incident ray parrellel to the axis refracts through the lens and travels in line with the principal focus.(so it appears to have come from the principal focus)
An incident ray passing through the lens towards the principal focus refracts through the lens and travels parrrlel to the axis.
An incident ray passing through the centre of the lens carries on in the same direction

Question 22

True or false? Opaque objects transmit light

Answer 22

False

Question 23

How do colour filters work

Answer 23

Colour filters are used to filter out different wavelengths of light so that only certain colours(wavelengths) are transmitted- the rest are absirbed