The intensity of a plane electromagnetic wave is 5 W/m2. It is incident on a perfectly reflecting surface. Find the radiation pressure.

Question

The intensity of a plane electromagnetic wave is 5 W/m2. It is incident on a perfectly reflecting surface. Find the radiation pressure. (A)  3.33× 10-9N/m2  (B)  3.33× 10-8N/m2  (C)  8.0× 10-8N/m2  (D)  8.0× 10-9N/m2

Tardigrade Admin · Accepted Answer

The radiation pressure p = (2S/c) =(2× 5/3× 108) =3.33× 10-8 N/m2

Q. The intensity of a plane electromagnetic wave is $5 W / m^{2} .$ It is incident on a perfectly reflecting surface. Find the radiation pressure.

$3.33 \times 1 0^{- 9} N / m^{2}$

$3.33 \times 1 0^{- 8} N / m^{2}$

$8.0 \times 1 0^{- 8} N / m^{2}$

$8.0 \times 1 0^{- 9} N / m^{2}$

The radiation pressure
$p = \frac{2 S}{c}$
$= \frac{2 \times 5}{3 \times 1 0 ^{8}}$
$= 3.33 \times 1 0^{- 8} N / m^{2}$

Q. The intensity of a plane electromagnetic wave is 5W/m2. It is incident on a perfectly reflecting surface. Find the radiation pressure.

3.33×10−9N/m2

3.33×10−8N/m2

8.0×10−8N/m2

8.0×10−9N/m2