Electromagnetic Spectrum

Pregunta	Respuesta
Electromagnetic Spectrum	GCSE Physics P1.6
List the different waves in the electromagnetic spectrum in decreasing order of wavelength.	Radio waves, microwaves, infrared radiation, visible light, ultraviolet, x-rays and gamma rays.
What speed do the waves in this spectrum travel at?	300 million metres per second.
Are the electromagnetic waves transverse or longitudinal?	Transverse.
What is the range, in terms of wavelength, for radio waves?	1000 metres to 10 centimetres.
Complete this sentence: Long radio waves are reflected by the _______ , while short waves _______ through the atmosphere and into space.	Long radio waves are reflected by the atmosphere , while short waves pass through the atmosphere and into space.
Name three uses for radio waves.	1. To transmit radio / T.V. programmes. 2. To detect objects (radar). 3. For communication with astronauts.
What is the range, in terms of wavelength, for microwaves?	1 metre to 1 millimetre.
Complete this sentence: Microwaves are absorbed by _______ , which then gain _______ and _______ making the _______ rise.	Microwaves are absorbed by cells / water, which then gain energy and vibrate making the temperature rise.
Name three uses for microwaves.	1. To heat foods and drinks. 2. Mobile phone communications. 3. Traffic cameras and radar.
What is the range, in terms of wavelength, for infrared radiation?	1 millimetre to 700 nanometres.
Complete this sentence: Infrared radiation, or also called _______ , is emitted by _______ (the hotter they are, the _______ radiation it emits), and is detected by _______ .	Infrared radiation, or also called thermal, is emitted by all things (the hotter they are, the more radiation it emits), and is detected by special detectors.
Name three uses for infrared radiation.	1. Night vision goggles. 2. Room heaters. 3. Passive Infrared devices (P.I.R.s), such as those in alarm systems.
What is the range, in terms of wavelength, for visible light?	700 nanometres to 400 nanometres.
Complete these sentences: Light is emitted by many things, including the _______ . All objects absorb some of the light, meaning they seem _______ . Light is detected by our _______ or light detectors.	Light is emitted by many things, including the sun . All objects absorb some of the light, meaning they seem coloured . Light is detected by our eyes or light detectors.
Name three uses for visible light.	1. To see. 2. Cameras and photography. 3. Fiber optic cables.
What is the range, in terms of wavelength, for ultraviolet light?	400 nanometres to 10 nanometres.
Complete these sentences: Ultraviolet is emitted by special _______ and can be found in _______ . It is detected by special _______. It can cause skin to _______ or to _______ , if the exposure is longer.	Ultraviolet is emitted by special lights and can be found in sunlight . It is detected by special detectors. It can cause skin to tan or to burn, if the exposure is longer.
Name three uses for ultraviolet light.	1. To verify bank notes. 2. To kill microbes. 3. To create tans.
What is the range, in terms of wavelength, for x-rays?	10 nanometres to 0.01 nanometres.
Complete these sentences: X-rays are emitted by heavy _______ . They are absorbed by _______ , which is why bones look white in x-ray scans.	X-rays are emitted by heavy elements . They are absorbed by calcium , which is why bones look white in x-ray scans.
Name three uses for x-rays.	1. To detect broken bones. 2. CAT scans. 3. To destroy tumours.
What is the range, in terms of wavelength, for gamma rays?	Less than 10 picometres.
Complete these sentences: Gamma rays are emitted by _______ , or _______ , nuclei. They are absorbed thick _______ or _______ .	Gamma rays are emitted by unstable , or radioactive, nuclei. They are absorbed thick lead or concrete .
Name three uses for gamma rays.	1. To sterilise medical equipment. 2. To make / destroy cancerous cells. 3. Radioactive tracers.

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