U1 - General wave properties (P2)

Question 1

Def: Wavefront

Answer 1

line joining points that are in phase on the same wave

Question 2

Def: Speed

Answer 2

rate of change of distance, distance a wave travels per minute

Question 3

Def: Frequency

Answer 3

num of cycles a wave makes per second, measured in hertz

Question 4

Def: Period

Answer 4

time it takes for a complete wave to pass a point

Question 5

How do you calculate Frequency

Answer 5

f = 1/ T

Question 6

Calculate speed

Answer 6

v = f x wavelength
or
v = wavelength/T

Question 7

How do you calculate wavelength

Answer 7

Wavelength = v/f

Question 8

Calculate period

Answer 8

T = 1/f

Question 9

Wavefronts can undergo 3 stages

Answer 9

Reflection
Diffraction
Rafraction

Question 10

Explain Reflection

Answer 10

when wave meets an object through which it cannot travel, it will be sent back in the direction it came from

Question 11

Explain Diffraction

Answer 11

the bending effect that occurs when a wave meets an obstacle or has to move through a small space

Question 12

Explain Refraction

Answer 12

the change in direction of a wave when it travels into a medium that makes the wave travel at a diff speed

Question 13

What happens when a wave strikes a straight barrier

Answer 13

reflected plane waves are produced

Question 14

What happens when a circular wave hits a straight barrier

Answer 14

The reflected waves will spread out from a point behind the barrier. The reflected waves are circular and have a centre that’s an equal distance behind the barrier, creating a virtual image of the source

Question 15

What is a demonstration of a wavefront

Answer 15

the reflection of a circular wave against a straight barrier

Question 16

what does frequency depend on

Answer 16

the source of the wave

Question 17

Can the frequency change if it enters a region where it travels more slowly

Answer 17

No
Frequency NEVER changes

Question 18

What happens to the wavelength of a wave if it enters a region where it travels more slowly

Answer 18

Wavelength will decrease

Question 19

When do waves move slowly

Answer 19

when it enters shallow water

Question 20

What happens when waves move from shallow to deeper water

Answer 20

the waves change direction , bending away from the normal when they pass from shallow to deeper water

Question 21

Why do waves change direction when entering shallow water

Answer 21

Bc. they move slower

Question 22

Lines of waves in shallow VS deep water

Answer 22

shallow waves - lines are closer together
deep waves - lines have more spaces between each other

Question 23

Refraction is a demonstration of

Answer 23

waves moving through water from shallow to deep

Question 24

What happens when straight waves use small gaps

Answer 24

they tend to spread out. the larger the wavelength in relation to the size of the gap, the more the waves will spread out

Question 25

Diffraction is a demonstration of

Answer 25

straight waves using small gaps