Section 2- Waves And The Electromagnetic Spectrum

Question 1

transverse wave

Answer 1

• perpendicular
• vibrations go up and down
• most waves are transverse

Eg. All electronic waves, S waves, ripples and waves in water

Question 2

longitudinal wave

Answer 2

•the vibrations are parallel to the direction the wave travels
•
Examples include sound waves and p waves

Question 3

equation for wave speed

Answer 3

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Question 4

how to measure the speed of sound

Answer 4

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Question 5

how to find speed of waves in solids

Answer 5

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Question 6

refraction(waves)

Answer 6

Waves changing direction at a boundary

Question 7

definition of absorbed

Answer 7

If the wave is absorbed the wave transfers energy to the material’s energy stores

Often transferred to a thermal store which leads to heating (how microwaves work)

Question 8

definition of transmitted

Answer 8

If a wave is transmitted the waves carries on travelling through the material.

This often leads to refraction

Question 9

definition of reflected

Answer 9

If a wave is reflected this means the ray is neither absorbed or transmitted but instead ‘sent back’

This is how echoes are created

Question 10

what causes sound waves?

Answer 10

Caused by vibrating objects

Question 11

what type of wave are sound sound waves?

Answer 11

Longitudinal waves

Question 12

how does sound travel in a gas?

Answer 12

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Question 13

how does sound travel in a solid?

Answer 13

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Question 14

how does sound travel in a liquid?

Answer 14

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Question 15

what are echoes?

Answer 15

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Question 16

explain how humans hear sound

Answer 16

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Question 17

explain how ultrasound works

Answer 17

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Question 18

what are ultrasounds used for?

Answer 18

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Question 19

infrasound

Answer 19

Sound with frequencies lower than 20Hz

Question 20

definition of seismic waves

Answer 20

• earthquakes and explosions cause seismic waves
• can be detected with a seismometer
• two main types p waves and S waves

Question 21

p-waves

Answer 21

• longitudinal
• travel through solids and liquids
• travel faster than S waves

Question 22

s-waves

Answer 22

• transverse
• only travel through liquids
• slower than p waves

Question 23

reflection (light)

Answer 23

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Question 24

definition of refraction

Answer 24

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Question 25

what happens when the light refracts off a smooth surface?

Answer 25

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Question 26

what happens when the light refracts off a rough surface?

Answer 26

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Question 27

how to investigate fraction

Answer 27

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Question 28

definition of converging/convex lens

Answer 28

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Question 29

definition of diverging/concave lens

Answer 29

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Question 30

how does light travel through a convex lens?

Answer 30

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Question 31

how does light travel through a concave lens?

Answer 31

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Question 32

how can you increase the power of the lenses?

Answer 32

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Question 33

definition of virtual image

Answer 33

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Question 34

definition of real image

Answer 34

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Question 35

list the electromagnetic spectrum

Answer 35

* radio waves * microwaves * infrared radiation * visible light * ultra violet * x-rays * Gamma rays

Question 36

which has the longest wavelength in the electromagnetic spectrum?

Answer 36

Radio waves

Question 37

which has the lowest frequency in the electromagnetic spectrum?

Answer 37

Radio waves

Question 38

how can EM be used for communication ?

Answer 38

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Question 39

uses and features of each in the EM spectrum

Answer 39

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Question 40

which has the shortest wavelength in the electromagnetic spectrum?

Answer 40

Gamma rays

Question 41

which has the highest frequency in the electromagnetic spectrum?

Answer 41

Gamma rays