Answer :

(a) Given : Power of the bulb = 100 W

Since, 5% of the power of a 100 W light bulb is converted to visible radiation, therefore the power of visible radiation can be calculated as follows:



P’ = 5W


The average intensity of visible radiation at a distance of 1m from the bulb can be calculated by using the following formula:





I = 0.398 W/m2


(b) The average intensity of visible radiation at a distance of 10 m from the bulb can be calculated by using the following formula:


I = P’/4π d2


I =


I = 5/1256


I = 0.00398 W/m2


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
caricature
view all courses
RELATED QUESTIONS :

Sea water at freqPhysics - Exemplar

Displacement currHC Verma - Concepts of Physics Part 2

A long straight cPhysics - Exemplar

You are given a 2Physics - Exemplar

Using B = μ0HC Verma - Concepts of Physics Part 2

A plane EM wave tPhysics - Exemplar

A plane EM wave tPhysics - Exemplar

A variable frequePhysics - Exemplar

You are given a 2Physics - Exemplar