CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon


Question

Light is incident normally on a completely absorbing surface with an energy flux of $$25 W cm^{-2}$$.  if the surface has an area of $$25 cm^{-2}$$, the momentum transferred to the surface in 40 min time duration will be : 


A
5.0×103Ns
loader
B
3.5×106Ns
loader
C
1.4×106Ns
loader
D
6.3×104Ns
loader

Solution

The correct option is D $$5.0 \times 10^{-3} Ns$$
Pressure = $$\dfrac{I}{C}$$
Force = Pressure $$\times$$ Area = $$\dfrac{I}{C}$$. Area
Momentum transferred = Force . $$\Delta t$$
$$= \dfrac{I}{C} . $$ Area .$$ \Delta t$$
$$= \dfrac{25 \times 10^4}{3 \times 10^8} \times 25 \times 10^{-4} \times 40 \times 60$$
$$\rightarrow 5 \times 10^{-3} N-s$$

Physics

Suggest Corrections
thumbs-up
 
0


similar_icon
Similar questions
View More


similar_icon
People also searched for
View More



footer-image