Chapter 12 Electromagnetic Spectrum
What is a property of all electromagnetic waves?
They are deflected by magnets
They are positively charged
They travel at the speed of sound
They travel through a vacuum.
Which statement about electromagnetic waves is incorrect?
They transfer energy from one place to another.
They have the same frequency in vacuum.
They travel at the speed of light through vacuum
They travel as transverse waves
Radio waves and gamma rays travelling in empty space have the same _________________.
Which of the following best describes light waves travelling from the Sun to Earth?
Transverse and electromagnetic
Longitudinal and electromagnetic
Transverse and mechanical
Longitudinal and mechanical
Which electromagnetic wave travels at the highest speed through a vacuum?
none - all have the same speed
X-ray are one type of electromagnetic radiation. Which row is correct for X-rays
Type of wave: longitudinal Speed of wave in vacuum: 340 m/s
Type of wave: longitudinal Speed of wave in vacuum: 3 x 10⁸ m/s
Type of wave: transverse Speed of wave in vacuum: 340 m/s
Type of wave: transverse Speed of wave in vacuum: 3 x 10⁸ m/s
The diagram shows some components of the electromagnetic spectrum in order of increasing frequency. What are P, Q and R?
P: gamma rays Q: ultra-violet R: infra-red
P: microwaves Q: infra-red R: gamma rays
P: microwaves Q: ultra-violet R: gamma rays
P: ultra-violet Q: infra-red R: microwaves
Which row lists components of the electromagnetic spectrum in order of increasing wavelength?
X-rays, infrared, visible light, microwaves, radio waves
Gamma rays, microwaves, ultraviolet, infrared, radio waves
Infrared, visible light, ultraviolet, X-rays, gamma rays
Gamma rays, ultraviolet, visible light, microwaves, radio waves
What happens to the frequency and the speed of a light wave as it passes from air into glass?
The frequency decreases and the speed increases.
The frequency increases and the speed decreases.
The frequency remains the same and the speed increases.
The frequency remains the same and the speed decreases.
Which one of the following devices can operate without the use of electromagnetic waves?
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?
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?
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?
killing cancerous cells
television remote controller
Which component of the electromagnetic spectrum is used in for satellite television?
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?
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