Chapter 11 - Properties of Waves Flashcards Preview

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Flashcards in Chapter 11 - Properties of Waves Deck (31):
1

What are waves?

waves are a means of transferring energy from place to place

2

Does this slinky represent a longitudinal or transverse wave?

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Transverse

3

Does this represent a transverse or longitudinal wave?

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Longitudinal

4

What is a transverse wave?

- One that oscillates at right angles to the direction in which the energy or wave is moving

5

Name an example of a transverse wave

- light waves

- waves travelling on the surface of water

6

What is a longitudinal wave?

- A longitudinal wave is one in which the oscillations, are along the direction in which the energy or wave is moving

7

Name an example of longitudinal wave

Sound waves

8

Label:

a) Peak

b) Trough

c) Wavelength

d) Amplitude

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A image thumb
9

What is the amplitude?

- Maxiumum movement of particles from their resting position caused by a wave

10

What is the wavelength?

- Distance between a particular point on a wave and the same point on the next wave

11

What is the frequency?

- Number of waves produced each second by a source

- Or the number passing a particular point each second

12

What is frequency measured in?

Hertz (Hz)

13

What is the period?

- The time it takes for a source to produce one wave

14

what is the equation for frequency?

__________________

time period (s)

15

what is the equation for time period?

1

------------------

frequency

16

Calculate the period of a wave a frequency of 200 Hz

T = 1 / frequency

= 1/200

= 0.005

= 5 ms

17

What is the equation for wave speed?

frequency x wavelength

18

A tuning fork creates sound waves with a frequency of 170 Hz. If the speed of sound in air is 340 m/s, calucate the wavelength of the sound waves

wave speed = frequency x wavelength

340 = 170 x wavelength

340 = 170 x 2

= 2m

19

Explain how a ripple tank works (6 points)

- Motor is turned on

- Wooden bar vibrates

- Creating a series of ripples on the surface of the water

- Light placed above the tank creates patterns

- Patterns of the water waves on the floor 

- We can see how water waves are behaving through patterns

20

In reflection, the angle of incidence is ....... to the angle of reclection

equal

21

what happens to a wave when they strike a concave barrier?

- they become curved and are made to converge

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22

what happens to waves when they strike a convex barrier?

- they are made to diverge

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23

What is refraction?

- When waves change speed they change direction, when they cross a boundary between two substances with different densities

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24

What is an example of refraction?

waves through glass and air

25

What is diffraction?

the process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the wave forms produced.

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26

Example of diffraction around an edge

radio waves that are diffracted as they pass over hills

27

When light reflects from the surface of a plane mirror, the angle of incidence is ..................... the angle of refraction

equal to

28

Calculate the wavelength (2)

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- number of waves/cycles = 3.5

- 0.60 = 0.17 (m)

29

The wavelength of a wave is 0.17m. Calculate the frequency of this microwave. [speed of microwave in free space = 3x10 to the 8 m/s²]

wave speed = frequency x wavelength

wave speed / wavelength = frequency

3x10 to the 8 / 0.17 = 1.8x10 to the 9 

1.8x10 to the 9 Hz

30

Name the effect shown by the radio waves in diagram 1 (1)

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- Diffraction

31

Suggest why this effect is not shown by the microwaves in diagram 2 (2)

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- microwaves not diffracted as much

 - diffraction (only seen) when size of barrier/gap comparable to wavelength

- radio-waves have (much) longer wavelength than microwaves/RA;