MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Gauss's Law

Consider the ...

Question

Consider the following statements.
$1.$ Stefan's constant is the same for all black bodies.
$2.$ Thermal radiations travel with the speed of $3 \times 10^{8} m / s$ .
$3.$ Thermal radiation exhibit diffraction.
$4.$ Stefan's law is applicable for all heated bodies.
Which of the statements given above are correct?

A

1, 3

and

4

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B

2, 3,

and

4

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

1, 2

and

3

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

D

1, 2, 3

and

4

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C $1, 2$ and $3$
Stefan's law is applicable to black bodies only and not for all the bodies. So, statement 4 is incorrect.

Suggest Corrections

thumbs-up

0

Similar questions

Q. Consider the following statements.

1.

Thermal radiation are electromagnetic waves.

2.

Thermal radiations are reflected from mirror.

3.

All bodies emit thermal radiations at all temperature.

4.

Thermal radiations of all wavelengths travel in free space with same velocity.
Which of the statement(s) given above are correct?

Q. All bodies emit heat energy from their surfaces by virtue of their temperature. This heat energy is called radiant energy of thermal radiation. The heat that we receive from the sun is transferred to us by a process which, unlike conduction or convection, does not require the help of a medium in the intervening space which is almost free of particles. Radiant energy travels in space as electromagnetic spectrum. Thermal radiations travel through vacuum with the speed of light. Thermal radiations obey the same laws of reflection and refraction as light does. They exhibit the phenomena of interference, diffraction and polarization as light does.
The emission of radiation from a hot body is expressed in terms of that emitted from a reference body (called the black body) at the same temperature. A black body absorbs and hence emits radiations of all wavelengths. The total energy E emitted by a unit area of a black body per second is given by

E = σ T^{4}

where T is the absolute temperature of the body and

σ

is a constant known as Stefan's constant. If the body is not a perfect black body, then

E = ε σ T^{4}

ε

is the emissivity of the body.
What is the SI unit of Stefan's constant?

Q. The heat conduction equation

\frac{d Q}{d t} = - k A (\frac{d T}{d x})

applied for heat transfer through a plane slab presumes:
1. Steady- state one-dimensional conduction.
2. Constant value of thermal conductivity
3. The bounding surfaces are isothermal.
4. Temperature gradient is constant.
of these statements:-

Q. The molecular shapes of diborane is shown below.
Consider the following statements for diborane :
1. Boron is approximately

s p^{3}

B - H - B

180^{\circ}

3. There are two terminal

B - H

bonds for each boron atom
4. There are only 12 bonding electrons available

The correct statements are:

Consider the following statements related to money supply:-

Which of the above statements are incorrect?

2 and 3 only
2, 3 and 4 only
1, 2 and 4 only
1, 2 and 3 only

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Gauss' Law

PHYSICS

Watch in App

explore_more_icon

Explore more

Standard XII Physics

Join BYJU'S Learning Program

CrossIcon