# 50 W/m2 energy density of sunlight is normally incident on the surface of a solar panel.  Some part of incident energy (25%) is reflected from the surface and the rest is absorbed.  The force exerted on 1m2 surface area will be close to (c=3 108 m/s): (a) 20 10−8 N (b) 35  10−8 N (c) 15  10−8 N (d) 10 10−8 N

## Question ID - 51274 :- 50 W/m2 energy density of sunlight is normally incident on the surface of a solar panel.  Some part of incident energy (25%) is reflected from the surface and the rest is absorbed.  The force exerted on 1m2 surface area will be close to (c=3 108 m/s): (a) 20 10−8 N (b) 35  10−8 N (c) 15  10−8 N (d) 10 10−8 N

3537

p=  and pressure =I/c

∴  +  ⇒   for one photon

∴    =pressure

But =50 W/m2

=Pressure

∴    Fn=  =20 10−8 N

Next Question :

A child is looking for his father. He went 90 meters in the East before turning to his right. He went 20 meters before turning to his right again to look for his father at his uncle's place 30 meters from this point. His father was not there. From here he went 100 meters to the North before meeting his father in a street. How far did the son meet his father from the starting point ?

(A) 80 meters                       (B) 100 meters

(C) 140 meters                     (D) 260 meters