P2.1 What types of electromagnetic radiation are there?

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  • Created on: 24-04-16 20:15
How can the electromagnetic radiation from one object affect another object some distance away?
a. one object (a source) emits radiation b. radiation travels outwards from the source and can be reflected, transmitted and/or absorbed by materials it encounters c. radiation may affect another object (a detector) some distance away when absorbed
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What is light?
Light is one of a family of radiations called the electromagnetic spectrum
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How does a beam of electromagnetic radiation transfer energy?
In ‘packets’ called photons
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How does frequency of electromagnetic radiation affect the energy transferred by each photon?
The higher the frequency of an electromagnetic radiation, the more energy is transferred by each photon
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List the electromagnetic radiations in order of the energy transferred by each photon, or in order of frequency?
Radio waves, microwaves, infrared, red visible light violet, ultraviolet, X-rays, gamma rays
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What speed do that all types of electromagnetic radiation travel at?
300,000 km/s
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What is a useful measure of the strength (or ‘intensity’) of a beam of electromagnetic radiation?
The energy arriving at a square metre of surface each second
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What does the energy transferred to an absorber by a beam of electromagnetic radiation depend on?
Both the number of photons arriving and the energy of each photon
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What happens to the intensity of a beam of electromagnetic radiation as the distance from the source increases and why?
The intensity of a beam of electromagnetic radiation decreases as distance from the source increases because the surface area it reaches is increasing and the EM radiation is partially absorbed by the medium it travels through
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Which types of electromagnetic radiation have enough energy to change atoms or molecules which can initiate chemical reactions?
Ultraviolet radiation, X-rays, gamma rays
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What can high energy ultraviolet radiation, X-rays and gamma rays cause?
Ionisation
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What are ionising electromagnetic radiations?
High enough photon energy to remove an electron from an atom or molecule
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Card 2

Front

What is light?

Back

Light is one of a family of radiations called the electromagnetic spectrum

Card 3

Front

How does a beam of electromagnetic radiation transfer energy?

Back

Preview of the front of card 3

Card 4

Front

How does frequency of electromagnetic radiation affect the energy transferred by each photon?

Back

Preview of the front of card 4

Card 5

Front

List the electromagnetic radiations in order of the energy transferred by each photon, or in order of frequency?

Back

Preview of the front of card 5
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