MCQ
The unit of Stefan's constant $\sigma$ is
- A$W m^{-2} K^{-1}$
- B$W m^2 K^{-4}$
- ✓$W m^{-2} K^{-4}$
- D$W m^{-2} K^4$
✓
Answer
Correct option: C.
$W m^{-2} K^{-4}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
At a place, the magnitudes of the horizontal component and total intensity of the magnetic field of the earth are $0.3$ and $0.6$ Oersted respectively. The value of the angle of dip at this place will be
→In an ac circuit, the current is given by $i=5 \sin \left(100 t-\frac{\pi}{2}\right)$ and the ac potential is $V=200 \sin (100)$ volt. Then the power consumption is
→Two identical balls $A$ and $B$ each of mass $0.1 kg$ are attached to two identical massless springs. The spring mass system is constrained to move inside a rigid smooth pipe bent in the form of a circle as shown in the figure. The pipe is fixed in a horizontal plane. The centres of the balls can move in a circle of radius $0.06 m$. Each spring has a natural length of $0.06 \pi m$ and force constant $0.1 N / m$. Initially both the balls are displaced by an angle $\theta=\pi / 6$ radian with respect to the diameter $P Q$ of the circle and released from rest. The frequency of oscillation of the ball $B$ is
→A thermodynamic system undergoes cyclic process $A B C D A$ as shown in figure. The work done by the system is
→At $27^{\circ} \mathrm{C}$ a gas is suddenly compressed such that its pressure becomes $\frac{1}{8} t h$ of original pressure. Temperature of the gas will be $(\gamma=5 / 3)$
→Penetrating power of $X$-rays can be increased by
→To Verify Ohm's law, a student is provided with a test resistor $\mathrm{R}_{\mathrm{T}}$, a high resistance $\mathrm{R}_1$, a small resistance $\mathrm{R}_2$, two identical galvanometers $\mathrm{G}_1$ and $\mathrm{G}_2$, and a variable voltage source $\mathrm{V}$. The correct circuit to carry out the experiment is
→Stars are not visible in the day time because
A combination of two thin convex lenses of focal length $0.3 \mathrm{~m}$ and $0.1 \mathrm{~m}$ will have minimum spherical and chromatic aberrations if the distance between them is
→A force $\vec{F}=(5 \hat{i}+4 \hat{j})\ N$ acts on a body and produces a displacement $\vec{S}=(6 \hat{i}-5 \hat{j}+3 \hat{k}) m$. The work done will be
→