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Harris Academy N5 Physics > Waves > Flashcards

Waves Flashcards

(57 cards)

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1
Q

Give one use of X-rays.

A
  • medical X-ray scans
  • airport security scanners
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2
Q

What is meant by the period of a wave?

A

The period of a wave is the time taken for one wave to pass.

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3
Q

From the diagram shown, identify the amplitude of the wave.

A

D is the amplitude.

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4
Q

Give one application of microwaves.

A
  • cooking
  • mobile phone communications
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5
Q

State a detector of infrared radiation.

A
  • photodiode
  • phototransistor
  • thermistor
  • thermocouple
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6
Q

What does the prefix M stand for?

A

M stands for mega

mega = x 106

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7
Q

Which wave in the electromagnetic spectrum has the shortest wavelength?

A

Gamma rays have the shortest wavelength.

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8
Q

Give one application of radio waves.

A
  • Broadcasting
  • Satellite transmissions
  • Communications
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9
Q

From the diagram shown, identify the wavelength of the wave.

A

C is the wavelength.

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10
Q

What does the prefix µ stand for?

A

µ stands for micro

micro = x 10-6

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11
Q

Give one use of ultraviolet.

A
  • security marking
  • detecting forged bank notes
  • fluorescent lamps
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12
Q

What does the prefix m stand for?

A

m stands for milli

milli = x 10-3

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13
Q

What do all waves in the electromagnetic spectrum have in common?

A

All waves in the electromagnetic spectrum travel at the same speed (the speed of light).

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14
Q

Name the three quantities shown in this formula.

A

d = distance

v = speed

t = time

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15
Q

What is meant by diffraction?

A

Diffraction is the bending of waves around an obstacle.

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16
Q

In the diagram shown, what is the dotted line and what is important about where it is?

A

The dotted line is the normal.

The normal is at 90° to the surface of the medium.

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17
Q

What type of wave is a sound wave an example of?

A

A sound wave is an example of a longitudinal wave.

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18
Q

Name the three quantities shown in this formula.

A

v = speed

f = frequency

λ = wavelength

(λ is called ‘lambda’)

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19
Q

Name the seven different types of waves in the electromagnetic spectrum.

Try to list them from long λ (wavelength) to short λ.

A

Radio (long λ)

Microwaves

Infrared

Visible

Ultraviolet

X-rays

Gamma rays (short λ)

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20
Q

The diagram shows what would happen if waves of a short wavelength approach an obstacle.

What would be observed if the waves had a long wavelength?

A

Long wavelengths diffract more than short wavelengths.

Therefore the waves would bend around the obstacle more.

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21
Q

Give one use of visible light.

A
  • photography
  • illumination
    • car headlights
    • street lighting
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22
Q

What is the unit for frequency?

A

The unit for frequency is hertz (Hz)

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23
Q

What happens to the speed of a ray of light as it goes from glass into air?

Study These Flashcards
A

As a ray of light goes from glass into air, its speed increases.

(the light speeds up in a medium which is less optically dense)

24
Q

What type of wave is a water wave an example of?

Study These Flashcards
A

A water wave is an example of a transverse wave.

25
What is the **unit** for **speed?**
The unit for **speed** is **metres per second** (**ms-1**)
26
Give **one** use of **infrared**.
* thermal imaging * remote controls * security systems
27
What is the **unit** for **time?**
The unit for **time** is **seconds** (**s**)
28
What is meant by the **frequency of a wave**?
**Frequency** is the number of waves per second.
29
In the diagram shown, what do the symbols **i** and **r** represent?
**i** = angle of incidence **r** = angle of refraction
30
What is meant by **refraction**? *(in terms of waves)*
**Refraction** is the **change of speed** (of a wave) caused by entering a different medium (e.g. air to glass). During refraction, the **wavelength** changes, and *sometimes* the **direction** changes (depending on the angle at which the waves enter the material).
31
A ray of light enters a block of glass (as shown). Describe the path of the ray of light after it enters the glass.
The ray of light will bend **towards the normal** as it enters the glass.
32
Give **one** use of **gamma rays**.
* sterilising food and medical equipment * treating cancer * medical tracers
33
Which wave in the electromagnetic spectrum has the **least energy**?
**Radio waves** have the **least energy**.
34
Which wave in the electromagnetic spectrum has the **greatest energy**?
**Gamma rays** have the **greatest energy**.
35
What happens to the **speed** of a **ray of light** as it goes from **air into glass**?
As a ray of light goes from air into glass, its **speed decreases**. (the light slows down in a medium which is more optically dense)
36
How is the **frequency** of a wave in the e.m. spectrum related to its **energy**?
The **higher the frequency** of a wave in the e.m. spectrum, the **more energy the wave has**.
37
What does the prefix **n** stand for?
**n** stands for **nano** **nano** = **x 10-9**
38
What **type** **of wave** are **microwaves** an example of?
Microwaves are an example of **transverse waves**.
39
What does the prefix **G** stand for?
**G** stands for **giga** **giga** = **x 109**
40
What is being shown in this diagram?
This is **diffraction** - the bending of waves around an obstacle.
41
What is meant by the **wavelength of a wave**?
**Wavelength** is the **distance** between a point on one wave and the same point on the next wave.
42
What **speed** do all **waves** in the **electromagnetic spectrum travel** at?
All waves in the electromagnetic spectrum travel at the **speed of light** - **3 x 108 ms-1**.
43
A ray of light exits a block of glass (as shown). Describe the path of the ray of light after it exits the glass.
The ray of light bends **away from the normal** as it exits the glass.
44
Describe what is meant by **gamma radiation**.
* Gamma radiation is a wave in the electromagnetic spectrum * Gamma rays have no mass or charge * Gamma rays have a very short wavelength and a high frequency
45
What is meant by the **amplitude** of a wave?
The **amplitude** of a wave is the **height of the wave**.
46
Complete the following sentence: All waves carry ...............
All waves carry **energy**.
47
Does a ray of light **always** change direction when it undergoes **refraction**?
No - not always. A ray of light which enters a material at 90° to the surface will not change direction. *(e.g. middle ray in diagram)*
48
Name the two quantities shown in this formula.
T = period f = frequency
49
What is the **unit** for **wavelength?**
The unit for **wavelength** is **metres** (**m**)
50
What does the prefix **k** stand for?
**k** stands for **kilo** **kilo** = **x 103**
51
State a **detector** of **radio waves**.
An **aerial** is used to detect radio waves.
52
State one **source** of **visible light**.
Sources of visible light include: ## Footnote * the Sun * light bulbs * anything hot enough to glow
53
Name an example of a **longitudinal wave**.
**Sound waves** are longitudinal waves.
54
What is meant by the statement "A source of waves has a frequency of 16 Hz" ?
This means that there are **16 waves per second** generated by the source.
55
What is the **unit** for **period?** *(period of a wave)*
The unit for **period** is **seconds** (**s**)
56
What is the **unit** for **distance?**
The unit for **distance** is **metres** (**m**)
57
Which wave in the electromagnetic spectrum has the **longest wavelength**?
**Radio waves** have the **longest wavelength**.

Harris Academy N5 Physics (6 decks)

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