The solid angle subtended by the periphery of an area 1 cm2... | PHYSICS - THE INTERNATIONAL SYSTEM OF UNITS | SolveeIt | Solveeit

Today, August 18

Question

The solid angle subtended by the periphery of an area 1 cm² at a point situated symmetrically at a distance of 5 cm from the area is

A

2 × 10^-2 steradian

B

4 × 10^-2 steradian

C

6 × 10^-2 steradian

D

8 × 10^-2 steradian

Answer

4 × 10^-2 steradian

Explanation

Solution

Solid angle, $d\Omega = \frac{dA}{r^{2}} = \frac{1cm^{2}}{(5cm)^{2}}$

= $0.04$ steradian

= $4 \times 10^{- 2}$ steradian