Waves

Question 1

What are the two types of waves ?

Answer 1

Longitudinal and transverse

Question 2

What is an example of a longitudinal wave ?

Answer 2

Sound waves

Question 3

What do all waves transfer ?

Answer 3

They transfer energy from one place to another .

Question 4

What are transverse waves ?

Answer 4

Oscillation are perpendicular to the direction of energy transfer

Question 5

What are longitudinal waves ?

Answer 5

Longitudinal waves are parallel to the direction of energy transfer

Question 6

What is the difference between longitudinal and transverse waves ?

Answer 6

All longitudinal waves require a medium to travel in eg. air or sound .
While not all transverse waves require a medium to travel though

Question 7

What is the amplitude of wave ?

Answer 7

The amplitude of a wave is the maximum displacement of a point of wave away from it’s undisturbed position.

Question 8

What is the wavelength of a wave ?

Answer 8

The wavelength a wave is the distance from a point of wave to the equivalent point from an adjacent wave

Question 9

What is frequency of a wave?

Answer 9

The frequency is the number of waves passing a point each second .

Question 10

What is a unit of frequency ?

Answer 10

Hertz (Hz)

Question 11

What is the period of wave ?

Answer 11

The period is the time ( in second ) for one wave to pass a point .

Question 12

What is the equation for a period ?

Answer 12

Period = 1/ frequency (Hz)

Question 13

What is wave speed ?

Answer 13

The speed at which a wave which move through a medium .

Question 14

What is the equation that links wave speed , frequency and wavelength ?

Answer 14

Wave speed = frequency x wavelength

Question 15

What is the unit of wave speed ?

Answer 15

m/s

Question 16

What is the unit for wavelength

Answer 16

m

Question 17

Convert cm to m

Answer 17

Divide by 100

Question 18

What is angle of reflection equal to ?

Answer 18

Angle of incidence

Question 19

What is frequency range of human hearing ?

Answer 19

20Hz to 20kHz
1kHz = 1000Hz

Question 20

How do sound waves travel though a solid ?

Answer 20

The particles vibrate and transfer kinetic energy through the material

Question 21

What are ultra sound waves ?

Answer 21

Ultra sound waves are waves which have a frequency higher than upper limit of human hearing (20kHz)

Question 22

Give an example use for ultrasound waves ?

Answer 22

Medical or industrial imaging

Question 23

What natural events causes seismic waves to be producing ? What types are produced ?

Answer 23

Earthquakes
They produce both P-waves and S-waves

Question 24

State a difference between the mediums that P-waves and S-waves can travel through ?

Answer 24

P-waves travels through solids and liquids
S-waves only travel through solids ( not liquids )

Question 25

What type of spectrum do electromagnetic form ?

Answer 25

A continuous spectrum

Question 26

Oder the type of electromagnetic radiation from lowest to highest frequency ? Raging martins Invade Venus Using X-ray Guns

Answer 26

Radio waves Microwaves Infrared Visible light Ultraviolet X ray Gamma rays

Question 27

As we go down the electromagnetic spectrum what happens ? In terms of wavelengths and frequency

Answer 27

There is a decrease in a wavelength There’s an increase in frequency

Question 28

In what direction ( relative to the normal ) do waves refract when entering a denser material ?

Answer 28

They bend towards the normal The angle of refraction is less than the angle of incidence

Question 29

How can radio waves create an alternating current in a circuit ?

Answer 29

When radio waves are absorbed,they can induce oscillations in a circuit with the same frequency as the waves themselves .

Question 30

Where do gamma rays originate from ?

Answer 30

They originate originate from changes in the nuclei of atoms

Question 31

What health effect can ultraviolet waves cause ?

Answer 31

They can cause skin to age prematurely They increase the risk of developing skin cancer

Question 32

What health effects can x-rays and Gamma rays cause ?

Answer 32

They are ionising radiation so can cause mutation in genes They can lead to an increased risk of developing various cancer

Question 33

Give two practical uses of x-rays and gamma rays ?

Answer 33

Medical imaging and treatment

Question 34

Give two practical use of ultraviolet ?

Answer 34

Energy efficient lamp Sun tanning

Question 35

Give one practical use of visible light

Answer 35

Fibre optics communication

Question 36

Give three practical uses of infrared radiation

Answer 36

Electrical heater Cooking food Infrared cameras

Question 37

Give two uses of radio wave radiation ?

Answer 37

Television Radio

Question 38

Give two uses of microwave radiation ?

Answer 38

Satellite Communications Cooking food

Question 39

What are the properties of an object that is more than 2 focal length from the lens ?

Answer 39

Image is diminished Image is inverted Image is real

Question 40

What are properties of an object that is between 1 and 2 focal lengths from the lens ?

Answer 40

Image is magnified Image is inverted Image is real

Question 41

What is meant by the focal distance of a lens ?

Answer 41

The distance from the lens to the principal focus

Question 42

What is the equation for magnification ?

Answer 42

Magnification = image height divide by object height

Question 43

What is the difference between the image produced by a convex and concave lens ?

Answer 43

Convex lens can produce real and virtual images Concave lenses only produce virtual images

Question 44

What is called when there’s a reflection from a smooth surface in a single direction ?

Answer 44

Specular reflection

Question 45

What is it called when a reflection from a rough surface causes scattering ?

Answer 45

Diffuse reflection

Question 46

Why do white objects appear white ?

Answer 46

White objects appear white because they reflect all the wavelengths of the visible lights equally .

Question 47

Why do black objects appear to be black ?

Answer 47

Objects appear to be black , if all wavelengths are absorbed .

Question 48

How does a red colour filter work ?

Answer 48

A red filter absorbs all wavelengths of light other than those in the red range spectrum . This means only red light passes through the filter .

Question 49

What colour or visible light has the highest frequency ?

Answer 49

Blue

Question 50

What colour or visible light has the largest wavelength

Answer 50

Red

Question 51

What is the colour of an opaque object determined by ?

Answer 51

Wavelengths which a more strongly refracted

Question 52

What do all bodies (objects ) emit and absorb ?

Answer 52

Infrared radiation

Question 53

What happens to the quantity of infrared radiation emitted by an object as temperature increases

Answer 53

The hotter the object , the more infrared radiation it will emit

Question 54

What is a perfect black body ?

Answer 54

A perfect black body is an object that absorbs all radiation incident on it

Question 55

What does a black body not do ?

Answer 55

A black body does not reflect or transmit any radiation

Question 56

What can be said about the rates of emission and absorption for a body at constant temperature ?

Answer 56

The body is absorbing and emitting radiation at the same time

Question 57

Give two factors that affect the temperature of the Earth ?

Answer 57

The earths rate of absorption and emission of radiation at The amount of reflection of radiation into space