Chapter 6 - Electromagnetic Waves Flashcards

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1
Q

What wave has the longest wavelength and lowest frequency

A

Radio waves

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2
Q

What is the link between the frequency of an electromagnetic wave and the energy it transfers

A

The higher the frequency of an electromagnetic wave, the more energy it transfers

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3
Q

What happens the shorter the wavelengths

A

The more information the waves carry

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4
Q

What are optical fibres used for

A

To transmit signals carried by visible light or infrared radiation. The signals travel down the fibre by repeated total internal reflection

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5
Q

Why are optical fibres useful in communication

A

They carry much more information and are more secure than radio wave or microwave transmissions

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6
Q

What is the Doppler effect

A

The wavelength and frequency of the waves detected by the observer changing from the original produced by the source

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7
Q

What happens when the source moves away from the observer

A

The observer wavelength increase and the frequency decreases

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8
Q

What happens when the source moves towards the observer

A

The observers wavelength decreases and the frequency increases

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9
Q

What does red shift mean

A

The frequency has decreased and the wavelength has increased. It is evidence that the universe is expanding.

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10
Q

What does blue shift mean

A

A galaxy is moving towards us.

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11
Q

What happens the further away the Galaxy

A

The bigger the red shift. This suggests that distant galaxies are moving away from us and the most distant galaxies are moving the fastest.

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12
Q

What is the Big Bang theory

A

A massive explosion that started at a very small initial point.

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13
Q

If the universe behind with a Big Bang, what would have been produced

A

High energy gamma radiation would have been produced. As universe expanded, this would have become lower energy radiation

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14
Q

What is the radiation produced by the Big Bang

A

(CMBR) cosmic microwave background radiation

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15
Q

What wave has the shortest wavelength and highest frequency

A

Gamma rays

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