The momentum of 1 J of energy in an electromagnetic wave is A)1.5 × 10^-9 kg∙m/s. B)3 × 10^-9 kg∙m/s. C)1 kg m/s. D)1 × 10-17 kg∙m/s. E)1000 kg m/s.

Question

Quizplus · Accepted Answer

The momentum p of an electromagnetic wave is given by p = E/c, where E is the energy and c is the speed of light (approximately 3 × 10^8 m/s). For 1 J of energy, p = 1 J / (3 × 10^8 m/s) = 3.33 × 10^-9 kg∙m/s, which is closest to option B.

The Momentum of 1 J of Energy in an Electromagnetic