Chapter 12 Electromagnetic Spectrum
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What is a property of all electromagnetic waves? *
1 point
Which statement about electromagnetic waves is incorrect? *
0 points
Radio waves and gamma rays travelling in empty space have the same _________________. *
1 point
Which of the following best describes light waves travelling from the Sun to Earth? *
1 point
Which electromagnetic wave travels at the highest speed through a vacuum? *
1 point
X-ray are one type of electromagnetic radiation. Which row is correct for X-rays *
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The diagram shows some components of the electromagnetic spectrum in order of increasing frequency. What are P, Q and R? *
1 point
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Which row lists components of the electromagnetic spectrum in order of increasing wavelength? *
1 point
What happens to the frequency and the speed of a light wave as it passes from air into glass? *
1 point
Which one of the following devices can operate without the use of electromagnetic waves? *
1 point
Below are four statements about the uses of electromagnetic radiation. Gamma rays are used in medical treatment. Infra-red waves are used in sunbeds. Microwaves are used in satellite TV. X-rays are used in intruder alarms. How many of these statements are correct? *
1 point
When sections of a large metal pipe have been welded together, they are checked to discover whether there are any cracks in the joints. Which component of the electromagnetic spectrum is used for this purpose? *
1 point
The diagram shows the main components of the electromagnetic spectrum in order of increasing frequency. Some of the components are labelled. The component Q has frequencies below those of light. What are electromagnetic waves in component Q used for? *
1 point
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Which component of the electromagnetic spectrum is used in for satellite television? *
1 point
Radio waves travelling at 3 x 10⁸ m/s in air are transmitted from a vertical aerial at a frequency of 90 MHz. What is the wavelength of these waves? *
1 point
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