Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • Consider following statement  1. An electromagnetic wave incident upon a perfectly absorbing surface exerts pressure equal to that when the wave is incident upon a perfectly reflecti

Consider following statement 

1. An electromagnetic wave incident upon a perfectly absorbing surface exerts pressure equal to that when the wave is incident upon a perfectly reflecting surface

2. The radiation pressure is directly proportional to the magnitude of poynting vector 

Which of the statements given above is/are correct

Option: 1

(1)only


Option: 2

(2)only


Option: 3

Both


Option: 4

None


Answers (1)

As we have learnt

 

Energy density of EM wave -

\mu =\frac{1}{2} \epsilon _{o}E^{2}+ \frac{B^{2}}{2\mu_{o}}

- wherein

E = Electric field

B = Magnetic field

\epsilon _{o} = Permittivity of vacuum

 

 

 

Poynting vector=\frac{Energy}{Area\times Time}

                      =\frac{Eneergy\times distance}{\left ( Area\times dist \right )\times time}= \frac{energy}{volume}\times velocity

                     =Energy\times density\times velocity=4\times v

                    =Pointing\: Vector\propto energy\: density

So, pointing vector \propto radiation pressure

Posted by

Ramraj Saini

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

Four Kashmiri girls defy the odds, score 99+ percentile in JEE Main 2025
anam-khan

JEE, NEET, CUET coaching centres: Assam, Rajasthan have framed laws, but will they work?
anam-khan

JEE Main 2025 withheld results declared; NTA issues show cause notices ahead of action

Latest Question