Chapter 70 of 2363 min read

Electromagnetic spectrum

Why this is asked: Every part of the electromagnetic spectrum, from gamma rays to radio waves, travels at exactly the same speed c in vacuum — only wavelength and frequency change across it, contrary to a common trap implying higher-energy radiation 'travels faster.'

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Test yourself

•The electric field in a plane electromagnetic wave is given by $E_{z} = 60 cos (5 x + 1.5 \times 1 0^{9} t)$ V/m. Then the expression for the corresponding magnetic field is (here the subscripts denote the direction of the field):
•The property which is not of an electromagnetic wave travelling in free space is that:

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