Download App

Transmission of Heat — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsTransmission of Heat1 Mark
MCQ
Two spheres made of same material have radii in the ratio 1: 2 Both are at same temperature. Ratio of heat radiation energy emitted per second by them is
  • A
    $1: 2$
  • B
    $1: 8$
  • ✓
    $1: 4$
  • D
    $1: 16$
✓

Answer

Correct option: C.
$1: 4$
(c)$Q=A \varnothing \sigma T^4 $
$\Rightarrow Q \propto A \propto r^2 \quad(\because T=\text { constant })$
$\Rightarrow \frac{Q_1}{Q_2}=\frac{r_1^2}{r_2^2}$
$=\left(\frac{1}{2}\right)^2=\frac{1}{4}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Transmission of Heat→Transmission of Heat — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Pressure-temperature relationship for an ideal gas undergoing adiabatic change is $\left(\gamma=C_p / C_v\right)$
→
A body is thrown horizontally from the top of a tower of height 5 $m$. It touches the ground at a distance of $10 m$ from the foot of the tower. The initial velocity of the body is $(g=10 ms )$
→
A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time $t$ is proportional to
→
A step$-$down transformer is connected to main supply $200 \mathrm{~V}$ to operate a $6 \mathrm{~V}, 30 \mathrm{~W}$ bulb. The current in primary is
→
The displacement is given by $x=2 t^2+t+5$, the acceleration at $t=2 s$ is
→
In a communication system, noise is most likely to affect the signal
→
For a thermocouple, the temperature of inversion is that temperature at which thermo e.m.f. is
→
A 220 volt and 800 watt electric kettle and three 220 volt and 100 watt bulbs are connected in parallel. On connecting this combination with 220 volt electric supply, the total current will be
→
A current carrying wire of length $L$ is transformed into a coil of $N$ turns. To achieve maximum magnetic moment, the coil
→
The kinetic energy of electron and proton is $10^{-32} \mathrm{~J}$. Then the relation between their de-Broglie wavelengths is
→