A plane electromagnetic wave, has frequency of 2 . 0 × 10 10 Hz and its energy density is 1 . 02 × 10 - 8 J m - 3 in vacuum. The amplitude of the magnetic field of the wave is close to 1 4 πε 0 = 9 × 10 9 Nm 2 C 2 and speed of light = 3 × 10 8 m s - 1 .

Question

A plane electromagnetic wave, has frequency of 2 . 0 × 10 10 Hz and its energy density is 1 . 02 × 10 - 8 J m - 3 in vacuum. The amplitude of the magnetic field of the wave is close to 1 4 πε 0 = 9 × 10 9 Nm 2 C 2 and speed of light = 3 × 10 8 m s - 1 ., 150 nT, 160 nT, 180 nT, 190 nT

MARKS App · Accepted Answer

Energy Denisty = 1 2 B 2 μ 0 B = 2 × μ 0 × Energy density B = 2 × 4 π × 10 - 7 × 1 . 02 × 10 - 8 = 160 × 10 - 9 = 160 nT

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