P3 waves

Question 1

What does waves explain

Answer 1

The motion/behavior of light, sound and electromagnetic radiation

Question 2

What is wave produced by

Answer 2

by vibrating/oscillating medium

Question 3

Different patterns of ripples can be produced as

Answer 3

straight & circular ripples

Question 4

What is a ripple

Answer 4

Small wave or series of waves on the surface of water

Question 5

What is frequency and how does it relate to energy

Answer 5

Number of waves passing any point in 1 second (Hz)
Higher the energy –> Higher the frequency

No. of oscillations per second – 1/period

Question 6

What is a crest/peak

Answer 6

The top/highest point of the wave

Question 7

What is trough

Answer 7

The bottom/lowest point of the wave

Question 8

What is the Amplitude

Answer 8

Maximum displacement of wave from its rest point (+/-)
Height of wave from rest(middle) to the crest/trough

Question 9

What is wavelength

Answer 9

distance between any 2 corresponding points on a wave (m)

Question 10

What does the wave transfer

Answer 10

Only energy without transferring matter

Question 11

Oscillation

Answer 11

To and from movements of wave (One complete movement/cycle)

Question 12

Waves can undergo

Answer 12

1. Reflection (at a plane surface - Bouncing)
2. Refraction (through change of speed)
3. Diffraction (Through narrow gap)

Question 13

How do you find the Wave Speed

Answer 13

v = fλ
speed = frequency x wavelength

Question 14

What are the 2 types of wave

Answer 14

1. Longitudinal
2. Transverse

Question 15

Longitudinal waves

Answer 15

Direction of vibration is parallel to direction of propagation (move backwards/forwards)
Goes along the motion in 1 direction
Consists of Compression & refraction

Question 16

Transverse waves

Answer 16

Direction of vibration is at right angles to direction of propagation (up and down)
Vibrates perpendicular (at right angles) to the direction

Question 17

Examples of longitudinal waves

Answer 17

Sound, seismic P-waves

Question 18

Examples of transverse waves

Answer 18

Light, water, seismic S-waves

Question 19

If the speed of the wave is changed, what is changed

Answer 19

The wavelength

Question 20

How is the wavelength of faster/slower waves

Answer 20

Slower = shorter wavelength
Faster = longer wavelength

Question 21

Refraction in ripples

Answer 21

Ripple to shallower region = slower = wavelength decrease = closer to normal

Question 22

What is a wavefront

Answer 22

connecting all points (of same phase) of a wave with one single line

Question 23

When is wave reflected

Answer 23

when it hits an obstacle (bounce back)

Question 24

When is wave refracted

Answer 24

if block submerged (goes through)

Question 25

What is diffraction

Answer 25

spreading out of waves when they go through a gap or past the edge of a barrier

Question 26

What does diffraction depend on

Answer 26

Width of gap compared to wavelength

Question 27

What happens to the wavelength after diffration

Answer 27

Unchanged

Question 28

Diffraction - gap similar/small to wavelength

Answer 28

cause lot of spreading (e.g. sound waves)

Question 29

Diffraction - gap width much larger than wavelength

Answer 29

cause little spreading (e.g. light)

Question 30

How does wavelength relate to diffraction

Answer 30

Greater wavelength = greater diffraction

Question 31

How are ripples produced

Answer 31

something vibrating up and down vertically, starts the neighbors to move and energy is transferred by the wave (molecules remain in same place)