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Energy and momentum imparted by an EM wave

  • #1
Titan97
Gold Member
451
18

Homework Statement


A plane electromagnetic wave is incident on a material surface. The wave delivers a momentum ##p## and energy ##E##. Then which of the following is/are correct?

1) ##p=0,~E=0##
2) ##p\neq 0,~E=0##
3) ##p=0,~E\neq 0##
4) ##p\neq 0,~E\neq 0##

Homework Equations



None

The Attempt at a Solution


Is the answer (4)? When an em wave hits a surface, the electrons in it will start moving because of the electric field component. So it gets a momentum and some energy.
 

Answers and Replies

  • #2
Simon Bridge
Science Advisor
Homework Helper
17,841
1,642
Note:
If the question said that the wave delivers pizza P and Beer B then the correct statement would be ##P\neq 0, B\neq 0## ... it does not say how the wave delivers these things, perhaps it pushes a levitating train loaded with beer and pizza(?) - but that does not matter for the question as it is written.
 

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