Waves

Question 1

Mechanical waves

Answer 1

Mechanical waves need a medium to travel through and physically disrupt that mendium

Question 2

Electromagnetic waves

Answer 2

Electromagnetic waves do not need a medium to travel through and cause magnetic and electric disruption.

Question 3

Travelling waves

Answer 3

They carry energy through a medium without any overall movement of the medium.

Question 4

What direction does the longitudinal travel in?

Answer 4

Parallel

Question 5

What direction does the transverse wave travel in?

Answer 5

Perpindicular

Question 6

Reflection

Answer 6

The bouncing of a wave off an object.

Question 7

Refraction

Answer 7

The bending of a wave as it enters a different medium and changes speed.

Question 8

Diffraction

Answer 8

The spreading out of a wave as it moves through a gap or an obstacle.

Question 9

Interference Waves

Answer 9

Waves that combine to form a resultant amplitude made up of each wave’s individual amplitude.

Question 10

Constructive Interference

Answer 10

When waves combine to form a resultant greater than each individual wave’s amplitude.

Question 11

Destructive Interference

Answer 11

When waves combine to form a resultant smaller than each individual wave’s amplitude.

Question 12

Polarisation

Answer 12

A wave confined to a particular plane.

Question 13

Give examples of polarisation.

Answer 13

Sunglasses and photography

Question 14

What type of wave does this phenomenon refer to?

Answer 14

Transverse waves.

Question 15

Stationary Waves

Answer 15

Waves of the same frequency and amplitude that constructively and destructively interfere to produce a wave pattern in a confined space.

Question 16

The Doppler Effect

Answer 16

The apparent change in frequency due to relative motion between source and observer.

Question 17

What defines the pitch?

Answer 17

The frequency of a note.

Question 18

What defines the loudness?

Answer 18

The amplitude of a note.

Question 19

Quality of a note

Answer 19

The quality of a note is the relative strength and number of overtones present.

Question 20

Intensity of Sound

Answer 20

The rate of sound energy incident on 1m^2 at a right angle to the direction of motion of sound.

Question 21

Resonance

Answer 21

The transfer of energy between two bodies with the same natural frequency.

Question 22

Primary colours

Answer 22

The three colours that combine to make white light.

Question 23

Secondary colour

Answer 23

Combining two primary colours in equal amounts.

Question 24

Complementary colours

Answer 24

Primary and secondary colours that combine to give white light.

Question 25

Name the three primary colours.

Answer 25

Red, Green and blue.

Question 26

Name the three secondary colours and their combinations.

Answer 26

red + green = yellow
red + blue = magenta
blue + green = cyan

Question 27

Name the combinations of complementary colours to produce white light.

Answer 27

red + cyan = white
blue + yellow = white
green + magenta = white

Question 28

Name the order of electrospectrum

Answer 28

Long waves, radio waves, tv waves, microwaves, infrared, visible light, ultraviolet, x-rays and gamma rays.

Question 29

Coherent Waves

Answer 29

Two waves of the same frequency that are in step or a fixed amount out of step.

Question 30

Give an example of a longitudinal wave.

Answer 30

Seismic wave

Question 31

Give an example of a transverse wave.

Answer 31

Strings and electromagnetic waves

Question 32

Describe how stationary waves occur?

Answer 32

They occur when a wave is confined and reflects between two boundaries.

Question 33

Explain the red shift using the doppler effect.

Answer 33

If a visible light source is moving AWAY FROM YOU at high speed, it will appear RED.

If a visible light source if moving TOWARDS YOU at high speed, it will appear BLUE.