In electromagnetic spectrum, the frequencies of γ–rays, X–rays and ultraviolet rays are denoted by n1, n2 and n3 respectively then
n1 > n2 > n3
n1 < n2 < n3
n1 > n2 < n3
n1 < n2 > n3
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A plane electromagnetic wave of frequency 20 MHz travels through a space along x direction. If the electric field vector at a certain point in space is 6 V m–1, what is the magnetic field vector at that point?