An electromagnetic wave with intensity vector 6 watt / m 2 is absorbed by a surface of area 12 m 2. Find the force on the surface?

Question

An electromagnetic wave with intensity vector 6 watt / m 2 is absorbed by a surface of area 12 m 2. Find the force on the surface? (A) 24 N (B) 24 × 1010 N (C) 24 × 10-10 N (D) 24 × 10-8 N

Tardigrade Admin · Accepted Answer

F = PA: P =( I / c ) ∴ F=(I A/c)=(6 × 12/3 × 108) =24 × 10-8 N

Q. An electromagnetic wave with intensity vector 6 watt $/ m^{2}$ is absorbed by a surface of area $12 m^{2}$ . Find the force on the surface?

$24 N$

$24 \times 1 0^{10} N$

$24 \times 1 0^{- 10} N$

$24 \times 1 0^{- 8} N$

$F = P A : P = \frac{I}{c}$
$∴ F = \frac{I A}{c} = \frac{6 \times 12}{3 \times 1 0 ^{8}}$
$= 24 \times 1 0^{- 8} N$

Q. An electromagnetic wave with intensity vector 6 watt /m2 is absorbed by a surface of area 12m2. Find the force on the surface?

24N

24×1010N

24×10−10N

24×10−8N