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YEAR 10 - Physics > EM Waves > Flashcards

EM Waves Flashcards

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1
Q

What relationship do wavelength and frequency have to wave energy?

A

Increasing frequency (the same as decreasing wavelength) = Increasing energy

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2
Q

Which EM wave has the least energy?

A

Radio

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3
Q

Which EM wave has the most energy?

A

Gamma rays

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4
Q

What is a good mnemonic for remembering the EM spectrum?

A 
Rabbit
Mate
In
Very
Unusual (and)
Expensive
Garden
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5
Q

What is the order of the EM spectrum, from least to most energy?

A 
Radio
Microwaves
Infrared
Visible Light
Ultraviolet Radiation
X-Rays
Gamma Radiation
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6
Q

Which EM wave has the shortest wavelength?

A

Gamma Rays

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7
Q

Which EM wave has the largest wavelength?

A

Radio

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8
Q

What is the speed of EM waves?

A

ALL EM waves travel at 300 million m/s through a vacuum.

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9
Q

What are the uses of radio waves?

A
  • TV
  • Radio
  • Mobile Signals
  • Bluetooth
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10
Q

What are the uses of microwaves?

A
  • Communications (e.g. Satellite TV)

* Mobile phone signals

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11
Q

What are the uses of infrared?

A
  • Optical fibres (communication)
  • Remote controls (TVs)
  • Infrared scanners (medicine)
  • Infrared cameras
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12
Q

The shorter the wavelength of a radio wave…

A
  • The more information it can carry
  • The shorter the range (because it is absorbed by the atmosphere)
  • The less it spreads out (by diffraction)
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13
Q

What are different wavelengths of radio waves used for?

A
  • Microwaves - Satellite phone (can travel through the atmosphere)
  • Less than 1m - TV (can carry a lot of information)
  • 1 - 100m - Local radio stations (limited range)
  • More than 100m - International radio stations (long range)
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14
Q

What are optical fibres?

A

Very thin transparent wires that are used to transmit signals by light and infrared radiation.

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15
Q

What are the uses of ultraviolet radiation?

A
  • Sunbeds
  • Security pens
  • Fluorescent lights
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16
Q

What are the uses of X-Rays?

A
  • X-Ray pictures of broken bones
  • Tumour therapy
  • CT scanners
17
Q

What are the uses of gamma radiation?

A
  • Killing bacteria in food
  • Sterilising surgical instruments
  • Killing cancer cells
18
Q

What are the hazards of microwaves?

A

Can cause heating of internal body tissue.

19
Q

What are the hazards of infrared?

A

Can cause burns.

20
Q

What are the hazards of x-rays and gamma rays?

A

Can ionise cells, which can kill or damage the cell. Lower doses can cause cell mutation and cancer.

YEAR 10 - Physics (13 decks)

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