Heat and Thermal ExpansionHard

Question

Radiation from a black body at the thermodynamic temperature T1 is measured by a small detector at distance d1 from it. When the temperature is increased to T2 and the  distance to d2, the power received by the detector is unchanged. What is the ratio d2/d1 ? 

Options

A.
B.
C.
D.

Solution

Intensity in first case
I1 =
Intensity in second case
I2 =
Given I1 = I2 ⇒

Create a free account to view solution

View Solution Free
Topic: Heat and Thermal Expansion·Practice all Heat and Thermal Expansion questions

More Heat and Thermal Expansion Questions

n moles of an ideal triatomic linear gas undergoes a proses in which the temperature changes with volume as T = k1V2 whe...A mixture of n1 moles of monoatomic gas and n2 moles of diatomic gas has γ = 1.5 : -...A hollow copper sphere & a hollow copper cube of same surface area & negligible thickness, are filled warm water of same...During seed germination its stored food is mobilized by :...Ice starts forming in like with water at 0oC when the temperature is - 10oC. If the taken for 1 cm of ice be 7 hours, th...