Question
Physics Question on Electromagnetic waves
Electromagnetic radiation of intensity 0.6 Wn-2 is falling on a blank surface. The radiation pressure on the surface is:
A
2x10-9 Nm-2
B
3x10-9 Nm-2
C
4x10-9 Nm-2
D
6x10-9 Nm-2
Answer
2x10-9 Nm-2
Explanation
Solution
The correct option is: (A): 2x10-9 Nm-2
The radiation pressure (P) exerted by electromagnetic radiation on a surface can be calculated using the formula:
P = I / c
Where:
- P is the radiation pressure
- I is the intensity of the electromagnetic radiation
- c is the speed of light
Given the intensity I = 0.6 W/m² and the speed of light c ≈ 3.00 x 10^8 m/s, let's calculate the radiation pressure:
P = 0.6 / (3.00 x 10^8) ≈ 2 x 10^-9 N/m²
The calculated value matches the given answer of 2 x 10^-9 N/m².