Waves - Diffraction and EM spectrum Flashcards

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1
Q

Which wave on the EM spectrum has the longest wavelength?

A

Radio waves

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2
Q

Which wave on the EM spectrum has the shortest wavelength?

A

Gamma rays

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3
Q

If a wave has a high frequency what does that tell us about the wavelength?

A

It has a short wavelength

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4
Q

If a wave has a low frequency what does that tell us about the wavelength?

A

It has a long wavelength

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5
Q

Smaller wavelengths diffract (more/less) around objects.

A

They diffract less.

This is why houses in valleys cannot receive TV signals.

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6
Q

Longer wavelengths diffract (more/less) around objects.

A

They diffract more.

This is why houses in valleys can receive radio signals but cannot receive TV signals.

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7
Q

What is used to detect Radio waves?

A

Antenna

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8
Q

What is used to detect microwaves?

A

Antenna

CCD

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9
Q

What is used to detect infrared light?

A

Blackened thermometer
Photodiode
Phototransistor
Thermistor
LDR
Thermocouple

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10
Q

What is used to detect visible light?

A

Photodiode
Phototransistor
Thermistor
LDR
Photographic film

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11
Q

What is used to detect ultraviolet light?

A

Photodiode
Phototransistor
LDR
Fluorescent materials

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12
Q

What is used to detect x-rays?

A

Photographic film
Photodiode
Phototransistor
CCD

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13
Q

What is used to detect gamma rays?

A

Photodiode
Geiger-Muller tube

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14
Q

What are radio waves used for?

A

Radio and TV signals

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15
Q

What are microwaves used for?

A

Mobile phone signals

Heating up food

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16
Q

What is infrared light used for?

A

Thermal Imaging camera
Remote controls

17
Q

What is visible light used for?

A

Allows us to see

Lightbulbs

Lasers

18
Q

What is ultraviolet light used for?

A

Detecting counterfeit bank notes
Setting dental fillings
Sterilising medical instruments

19
Q

What are x-rays used for?

A

Airport security
Medical examinations
Non-destructive testing

20
Q

What are gamma rays used for?

A

Medical tracers

Killing cells

21
Q

What is diffraction?

A

The bending of waves around an object.

22
Q
A