WAVES

Question 1

What is an example of a transverse wave?

Answer 1

A ripple on water.

Question 2

What is an example of a longitudinal wave?

Answer 2

Sound waves.

Question 3

What do all waves do?

Answer 3

Transfer energy from one place to another.

Question 4

What type of energy to ripples transfer?

Answer 4

Kinetic energy.

Question 5

What type of energy do sound waves transfer?

Answer 5

Sound energy.

Question 6

What is a transverse wave?

Answer 6

• has oscallisitions that move up and down.

- the oscillations are perpendicular to the direction of energy transfer.

Question 7

What is the direction of energy transfer? (on both waves)

Answer 7

—–>

Question 8

What is a longitudinal wave?

Answer 8

• sound waves travel as particles in the air move from side to side.
• the oscillations are parallel to the direction of energy transfer.
• need a medium to travel in.

Question 9

What is the amplitude?

Answer 9

The maximum displacement of a point away from its undisturbed position. (the bit from the line to the peak of the wave).

Question 10

What is the wavelength?

Answer 10

The distance from one point on one wave to the equivalent point on the adjacent wave. (from peak to peak) OR COMPRESSION/ RAREFRACTION TO THE OTHER,

Question 11

What is the frequency?

Answer 11

The number of waves passing a point each second.

Question 12

What is frequency measured in?

Answer 12

Hz.

Question 13

What happens if we pass light through a prism?

Answer 13

A spectrum.

Question 14

What is the electromagnetic spectrum?

Answer 14

Radio Waves-microwaves-infrared-visible light- ultraviolet- x rays- gamma rays.

Question 15

How do you remember the electromagnetic spectrum?

Answer 15

RAW MEAT IS VERY UNSANITARY EXCEPT GIRAFFE.

Question 16

Where can electromagnetic waves travel through?

Answer 16

A vacuum in space.

Question 17

At what speed do electromagnetic waves travel in space?

Answer 17

3 X 10 (8)

Question 18

What is the period?

Answer 18

The time in seconds for one wave to pass a point.

Question 19

How do you work out the period?

Answer 19

1/frequency.

Question 20

How do you workout wave speed?

Answer 20

Frequency X wavelength

Question 21

What does wave speed mean?

Answer 21

The speed at which a wave moves through the medium (the speed at which energy is transferred).

Question 22

Describe the required practical in detail.

Answer 22

• seperate two people 500m
• one holding a symbol
• person A clashes symbols
• B starts timing when they see
• They stop timing when they hear.
• To find out do distance/time.

Question 23

What are the problems with the required practical?

Answer 23

-different reaction times.

Question 24

How do we fix the problems with the required practical?

Answer 24

-have a large number of observers and calculate the mean.

Question 25

What are microwaves absorbed by?

Answer 25

Foods that contain a water molecule.

Question 26

What are light waves absorbed by?

Answer 26

Black surfaces.

Question 27

What are microwaves reflected by?

Answer 27

metals.

Question 28

What are light waves reflected by?

Answer 28

Shiny metallic surfaces.

Question 29

When an electromagnetic wave is generated or absorbed where do the changes take place?

Answer 29

In the nuclei of atoms.

Question 30

What are the dangers of UV rays?

Answer 30

cancer and premature aging.

Question 31

What are the dangers of x-rays and gamma- rays?

Answer 31

Ionising radiation which can change the DNA.

Question 32

What happens when we heat atoms?

Answer 32

electrons move to a higher energy level. When it returns it generates an electromagnetic wave/.

Question 33

How are electromagnetic waves grouped?

Answer 33

In order of decreasing wavelength and increasing energy and frequency.

Question 34

How are radio waves produced?

Answer 34

• When an alternating current is passed through a wire in a radio.
• the oscillating (vibrating) particles produce a radio wave.

Question 35

What is the incident wave?

Answer 35

Wave fronts where all the waves are in phase with each other.

Question 36

What happens when a wave refracts?

Answer 36

• when the wave hits a denser material it slows down.
• one side of the wave hits it first so slows down first.
• this causes the wave front to bend towards the normal line.
• wave fronts will be closer together as velocity decreases
• Frequency is unchanged.