An electromagnetic wave of intensity 1400 W / m 2 falls on a metal surface of area 1.5 m 2 and is completely absorbed by it. Find out the force (in μ N ) exerted by the beam.

Question

An electromagnetic wave of intensity 1400 W / m 2 falls on a metal surface of area 1.5 m 2 and is completely absorbed by it. Find out the force (in μ N ) exerted by the beam. (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

F=(I A/c)=(1400 × 1.5/3 × 108) =7 × 10-6 N

Q. An electromagnetic wave of intensity $1400 W / m^{2}$ falls on a metal surface of area $1.5 m^{2}$ and is completely absorbed by it. Find out the force (in $μ N$ ) exerted by the beam.

$F = \frac{I A}{c} = \frac{1400 \times 1.5}{3 \times 1 0 ^{8}}$
$= 7 \times 1 0^{- 6} N$

Q. An electromagnetic wave of intensity 1400W/m2 falls on a metal surface of area 1.5m2 and is completely absorbed by it. Find out the force (in μN ) exerted by the beam.

F=cIA​=3×1081400×1.5​ =7×10−6N

Q. An electromagnetic wave of intensity $1400 W / m^{2}$ falls on a metal surface of area $1.5 m^{2}$ and is completely absorbed by it. Find out the force (in $μ N$ ) exerted by the beam.

$F = \frac{I A}{c} = \frac{1400 \times 1.5}{3 \times 1 0 ^{8}}$
$= 7 \times 1 0^{- 6} N$