Question

State (i) Stefan-Boltmann law and (ii) Wein’s displacement law.

Answer 1

Answer:

Stefan Boltzmann law states that the total energy radiated per unit surface area of black body across all wavelength per unit time. Whereas Wien's displacement states that the spectral radiance of black body radiation per unit wavelength.

Answer 2

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Stefan Boltzman law:

According to the law the energy emmitted per second per unit area by perfect black body is directly proportional to 4th power of absolute temperature.

$\frac{ϙ}{ᴀᴛ} \: \alpha \: {ᴛ}^{4} \\ \\ \frac{ϙ}{ᴀᴛ} = 0e {ᴛ}^{4}$

Wein's Displacement Law:

According to the law the wave length corresponding to maximum intensity inversely proportional to absolute temperature of body.

λmT = Constant

$ᴠᴀʟᴜᴇ \: ᴏғ \: \: ᴄᴏɴនᴛᴀɴᴛ \: \: ɪន \\ 2.9 \times {10}^{ - 3} m$

weins law is useful for estimating surface temperature of elastic bodies like moon,sun and stars.

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