An EM wave carrying energy 6 10 -8 J is completely absorbed by a surface. The momentum transferred is:

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An EM wave carrying energy 6 × 10-8 J is completely absorbed by a surface. The momentum transferred is:

Answer: 2 10 -16 kg m/s.

A 6 × 10-16 kg m/s
B 1 × 10-16 kg m/s
C 2 × 10-16 kg m/s
D 2 × 10-15 kg m/s

Correct answer: C. 2 × 10-16 kg m/s

Explanation: For full absorption, p = U/c = (6 × 10-8)/(3 × 108) = 2 × 10-16 kg m/s.

In an electromagnetic wave, the oscillating electric field (E) and magnetic field (B) are perpendicular to each other and to the direction the wave travels - a purely transverse wave that needs no medium, unlike sound.

Concept context

Maxwell's equations, EM spectrum, properties, and applications of each band.

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An EM wave carrying energy 6 &times; 10<sup>-8</sup> J is completely absorbed by a surface. The momentum transferred is:

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An EM wave carrying energy 6 × 10<sup>-8</sup> J is completely absorbed by a surface. The momentum transferred is: