P5.2 The Electromagnetic Spectrum Flashcards

1
Q

How speeds of EM radiation differ in a vacuum and air

A

Electromagnetic waves all travel at SAME SPEED in a vacuum and in air

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2
Q

What type of waves can be produced by oscillations in an electrical circuit

A

Radio waves

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3
Q

How can radio waves create an alternating current in a circuit

A

When radio waves absorbed,
they can induce oscillations in a circuit with the same frequency as the waves themselves

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4
Q

Where do gamma rays originate from

A

From changes in nuclei of atoms

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5
Q

What type of spectrum do electromagnetic waves form

A

A continuous spectrum

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6
Q

What health effects can ultraviolet waves cause

A

Cause skin to age prematurely
Increase risk of developing skin cancer

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7
Q

What health effects can X-rays and Gamma rays cause

A

Ionising radiation so can cause mutations in DNA
Lead to increased risk of developing various cancers

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8
Q

Practical uses for infrared radiation

A

Electrical heaters
Cooking food
Infrared cameras

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9
Q

Practical uses for microwave radiation

A

Satellite communications
Cooking food

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10
Q

Practical uses for radio waves

A

Television transmission
Radio transmission

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11
Q

Which part of the EM Spectrum can be seen by the human eye

A

Visible light
Eyes have a limited range of frequencies/wavelengths that it can detect

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12
Q

What determines the colour of visible light waves

A

Frequency of the light waves

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13
Q

What colour of visible light has the highest frequency

A

Blue

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14
Q

What colour of visible light has the largest wavelength

A

Red

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15
Q

What technique is used to detect objects in deep water and measure water depth

A

Echo sounding (sonar)
High frequency sound waves are emitted, reflected and detected
Time difference between emission and detection, alongside wave speed, are used to calculate distances

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