Questions
Four spheres P, Q, R and ,S are of same radius but made of different metals. Their densities are in the ratio 3 : 4 :6 : 5 and specific heats are in the ratio 2 : 5 : 3 : 6. These are
initially kept at same temperature and placed in the same surroundings. The sphere which has the slowest rate of cooling is:
detailed solution
Correct option is D
Rate of cooling =σA(T4-T04)mSdQdt=mcdθdtαAT4 mαr3ρ dθdtα1rcρ Ratio of rates=30:9:10:6Talk to our academic expert!
Similar Questions
For a black body at temperature 727°C, its radiating power is 60W and temperature of surrounding is 227° C. If temperature of black body is changed to 1227°C, then its
radiating power will be :
799 666 8865
support@infinitylearn.com
6th Floor, NCC Building, Durgamma Cheruvu Road, Vittal Rao Nagar, HITEC City, Hyderabad, Telangana 500081.
free study material
JEE Mock Tests
JEE study guide
JEE Revision Notes
JEE Important Questions
JEE Sample Papers
JEE Previous Year's Papers
NEET previous year’s papers
NEET important questions
NEET sample papers
NEET revision notes
NEET study guide
NEET mock tests
