Waves and Electromagnetic Spectrum

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Flashcards based on lecture notes about waves and the electromagnetic spectrum.

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31 Terms

1
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What is the direction of vibration in a transverse wave?

The direction of vibration is perpendicular to the direction of the wave.

2
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Give two examples of transverse waves.

Water waves and light waves.

3
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What is the direction of vibration in a longitudinal wave?

The direction of vibration is parallel to the direction of the wave.

4
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Give an example of a longitudinal wave.

Sound wave.

5
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What is frequency?

The number of complete waves produced per second.

6
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What is the SI unit for frequency?

Hertz (Hz).

7
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How many Hz are in 1 kHz?

1000 Hz

8
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How many Hz are in 1 MHz?

1,000,000 Hz

9
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What are crests?

The highest points of a wave.

10
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What are troughs?

The lowest points of a wave.

11
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What is amplitude?

The maximum displacement from the rest position.

12
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What is the SI unit for amplitude?

Metre (m).

13
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What is wavelength (λ)?

The distance between two successive crests or two successive troughs.

14
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What is the SI unit for wavelength?

Metre (m).

15
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Does a loud sound have a larger or smaller amplitude than a soft sound?

Larger amplitude.

16
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What are radio waves used for?

TV broadcasting and radar.

17
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What are microwaves used for?

Global Positioning Systems (GPS).

18
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What is a microwave oven used for?

Heating up food in a short time.

19
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What other types of communication are microwaves used for?

Mobile phone and satellite communication.

20
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What are infrared rays used for?

Remote control units and infrared thermometers.

21
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What is visible light used for?

To help us see.

22
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What process do plants use visible light for?

Photosynthesis.

23
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What is visible light used for in technology?

High-speed data transmission through optical fibres.

24
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Which electromagnetic waves have the longest wavelengths and lowest frequencies?

Radio waves.

25
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Which electromagnetic waves have the shortest wavelengths and highest frequencies?

Gamma rays.

26
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What are ultraviolet (UV) rays used for?

Forgery detectors.

27
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How do ultraviolet rays affect our bodies?

Cause our bodies to become tanned and help our bodies produce vitamin D.

28
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What is another use of ultraviolet rays?

To kill microbes and sterilise medical equipment.

29
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How are X-rays used in medicine?

Radiation therapy to kill cancer cells.

30
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What is a common medical application of X-rays?

To produce images of the body’s internal organs and bones.

31
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