Question: An electromagnetic standing wave in a certain material has frequency 1.20 x 1010 Hz and speed of propagation 210 x 108 m/s. (a) What is

An electromagnetic standing wave in a certain material has frequency 1.20 x 1010 Hz and speed of propagation 210 x 108 m/s.
(a) What is the distance between a nodal plane of B and the closest anti-nodal plane of B?
(b) What is the distance between an anti-nodal plane of E and the closest anti-nodal plane of B?
(c) What is the distance between a nodal plane of E and the closest nodal plane of B?

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