A plane electromagnetic wave is incident on a material surface. If the wave delivers momentum $$p$$ and energy $$E,$$ then
A.
$$p = 0,E = 0$$
B.
$$p \ne 0,E \ne 0$$
C.
$$p \ne 0,E = 0$$
D.
$$p = 0,E \ne 0$$
Answer :
$$p \ne 0,E \ne 0$$
Solution :
$$EM$$ waves carry momentum and hence can exert pressure on surfaces. They also transfer energy to the surface so $$p \ne 0$$ and $$E \ne 0.$$
Releted MCQ Question on Electrostatics and Magnetism >> Electromagnetic Waves
Releted Question 1
Out of the following options which one can be used to produce a propagating electromagnetic wave?
The electric field associated with an electromagnetic wave in vacuum is given by $$E = \hat i40\cos \left( {kz - 6 \times {{10}^8}t} \right),$$ where $$E,z$$ and $$t$$ are in $$volt/m,$$ metre and second respectively. The value of wave vector $$k$$ is