P1.5

Question 1

What are waves?

Answer 1

Oscillations or vibrations of particles.

Question 2

With a transverse wave, what direction to the way the wave travels are the oscillations?

Answer 2

Perpendicular (like string)

Question 3

With a longitudinal wave, what direction to the way the wave travels are the oscillations?

Answer 3

The same (like a spring)

Question 4

What is an example of a transverse wave?

Answer 4

Water waves

Question 5

What is an example of a longitudinal wave?

Answer 5

Sound waves

Question 6

What are 3 examples of electromagnetic waves?

Answer 6

Radio waves
Micro waves
Gamma rays

Question 7

Are electromagnetic waves transverse or longitudinal?

Answer 7

Transverse

Question 8

Can electromagnetic waves travel through a vacuum?

Answer 8

Yes

Question 9

What is the amplitude of a wave?

What is it measured in?

Answer 9

The maximum height of the wave, measured from the middle

M

Question 10

What is the wavelength of a wave?

What is it measured in?

Answer 10

The shortest distance between two coherent points on the wave

M

Question 11

What is the frequency of a wave?

What is it measured in?

Answer 11

The number of waves passing a point each second

Hz

Question 12

What is the electromagnetic spectrum?

Answer 12

Radio waves
Micro waves
Infrared radiation
Visible light
Ultraviolet
X-rays
Gamma rays

Question 13

What does the angle of incidence equal?

Answer 13

The angle of reflection

Question 14

What is refraction?

Answer 14

When sound or light waves change speed when they pass from a material of one density to another with a different one

Question 15

When a sound or light wave moves from an area of low density to an area of high density, which way does it bend?

Answer 15

Towards the normal

Question 16

When a sound or light wave moves from an area of high density to an area of low density, which way does it bend?

Answer 16

Away from the normal

Question 17

What is the shortest EM wave?

Answer 17

Gamma rays

Question 18

What is the longest EM wave?

Answer 18

Radio waves

Question 19

What are the uses of each EM wave?

Answer 19

Radio waves- TV & radio signals
Micro waves- Heating food & phone communications
Infrared radiation- Remote controls
Visible light- Seeing the world
Ultraviolet- Security pens
X-rays- Detecting broken bones & airport security
Gamma rays- Killing cancerous cells

Question 20

What is the Doppler effect?

Answer 20

The apparent change in the frequency of a wave caused by the relative motion of the source of the wave and the observer

Question 21

What is red shift?

Answer 21

Red shift occurs when light or other electromagnetic radiation is increased in wavelength, or shifted to the red end of the spectrum.

Question 22

How is a change in wavelength and frequency observed when a wave source is moving?

Answer 22

When the source is stationary, waves are released from a single point
-the wavelength frequency is observed as a constant
When the source is moving, the point at which the waves are released is changed every time.

Question 23

What is CMBR?

Answer 23

Microwaves coming from every direction in space.