The law which states that wave-length of maximum radiation is inversely proportional to the absolute of the emitting body is known as:

Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is __________ law.

A

Stefan's

B

Dalton's

C

Wien's

D

Kirchoffs

Radiant energy received by a body is proportional to (where, d = the distance between the object emitting radiation and that receiving it.)

A

$$\sqrt {\text{d}} $$

B

d

C

d²

D

d^1.5

The wavelength at which the maximum monochromatic emissive power occurs for a black body, is (where, T = absolute temperature of the black body)

A

α.T

B

α.$$\frac{1}{{\text{T}}}$$

C

α.T⁴

D

Independent of T

A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the

A

Global warming

B

Green house

C

Atmospheric effect

D

Ionosphere

একটি ধাতব তলে λ তরঙ্গদৈর্ঘ্যের একবর্ণী আলোকরশ্মি আপতিত হলে ফটো-ইলেক্ট্রন নির্গত হয় এবং এক্ষেত্রে বিভবের মান 3Vo একই তলে যখন 2λতরঙ্গদৈর্ঘ্যের একবর্ণী আলো আপতিত হয়, তখন নিবৃত্তি বিভবের মান Vol ফটো-ইলেক্ট্রন নির্গত হওয়ার জন্য ঐ তলটির সূচন তরঙ্গদৈর্ঘ্যের মান নির্ণয় কর।(A monochromatic light of wavelength λ is incident on a metallic surface then ejects photo-electron and the value of stopping potential is 3Vo. When the same surface is illuminated by a light of wavelength 2λ., the stopping potential becomes Vo. Calculate the threshold wavelength for this surface to eject photo electrons.)

A

6λ

B

8λ

C

4λ3

D

λ

E

4λ

Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

A

Minimum energy

B

Maximum energy

C

Both (A) and (B)

D

None of these

According to Wein's displacement law, the wavelength at which maximum radiation occurs

A

Is inversely proportional to the temperature

B

Is proportional to the temperature

C

Is inversely proportional to the pressure

D

Is proportional to the pressure

According to Stefan Boltzmann law, the total radiation from a black body per second per unit area is directly proportional to the

A

Absolute temperature

B

Square of the absolute temperature

C

Cube of the absolute temperature

D

Fourth power of the absolute temperature

According to Stefan's law, the total radiation from a black body per second per unit area is proportional to

A

Absolute temperature

B

T²

C

T⁵

D

T

For a perfect gas, according to Boyle’s law (where p = Absolute pressure, v = Volume and T = Absolute temperature)

A

$$\frac{{\text{v}}}{{\text{T}}}$$ = constant, if p is kept constant

B

pv = constant, if T is kept constant

C

$$\frac{{\text{T}}}{{\text{p}}}$$ = constant, if v is kept constant

D

$$\frac{{\text{p}}}{{\text{T}}}$$ = constant, if v is kept constant

The law which states that wave-length of maximum radiation is inversely proportional to the absolute of the emitting body is known as:

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