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8.1 Electromagnetic radiation has a wave-particle duality.
What does this mean? (2)
8.2 Arrange the following types of electromagnetic radiations in order of
decreasing wavelength.
Infrared, gamma ray, visible light, x-ray (2)
8.3 Define a photon. (2)
An electromagnetic wave has a wavelength of 2,5 x 10-9 m.
8.4 Calculate the amount of energy that a photon of this wave has. (6)
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