First slide
Radiation
Question

A Black metal foil receives radiation of  power P from a hot  sphere at absolute temperature T, kept at a distance d. If the temperature is doubled and distance is halved, then Power will be

Easy
Solution

Power radiated from the surface of a hot spherical surface is P = eσAT4, Intensity \large I=\frac {P}{4\pi d^2}
\large \therefore I\propto T^4/d^2
\large T_1=T,\;T_2=2T;\;d_1=d,\;d_2=d/2,\;P_1=P
\large P\propto \frac {T^4}{d^2};\;\frac {P_1}{P_2}=\left ( \frac {T_2}{T_1} \right )^4\left ( \frac {d_2}{d_1} \right )^2=\frac {1}{16}\left ( \frac {1}{4} \right )
\large P_2=64P

   
Get Instant Solutions
When in doubt download our app. Now available Google Play Store- Doubts App
Download Now
Recieve an sms with download link
Doubts App
OR
SCAN ME
Doubts App
Doubts App
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
info@infinitylearn.com
1800 419 4247
Quick Links
Become a Teacher
Careers
About Us
Teams
Life at Infinity Learn
Press
Scholarships
Study Material
Our Results
Courses
Blogs
Terms & Conditions
Privacy Policy
Copyright © 2024. All Rights Reserved 2024