with explanations for both please Ouestion 1 4 points Save An An electromagnetic

Question

with explanations for both please

Ouestion 1 4 points Save An An electromagnetic plane wave is traveling in the +z direction. The illustration below shows this wave an some instant in time. Points A, B, and Chave the same z coordinate. Question 1: At which of the three points (A, B orC) is the electric field magnitude the greatest? (A) Point A (B) Point B (C) Point C (D) The electric field magnitude is the same at all three points Question 2: Which of the following actions will increase the energy carried by this wave? (A) Increase E keeping frequency constant (B) Increase frequency keeping E constant (C) Both of the above actions will increase the energy of the wave (D) Neither of the above actions will increase the energy of the wave

Explanation / Answer

the waves that are propagating here are plane waves.

here the plane for electric fields are parallel to x-y plane. at every point on this plane the value is same.

here ABC lie on the plane parallel to x-y plane passing through 'A'

hence q1) ans is 'D'

Q2) if you increase frequency keeping electric field constant increases the energy because energy = hv

h is planck's constant ,v is frequency.

if you increase electric field keeping frequency constant increases the energy because the energy is proportional to the (amplitude)^2 ,energy = k E^2

k is constant,e is amplitude of electric field

hence answer is 'C'

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