Consider a spherical shell of radius r at temperature t. The black body radiation inside it can be considered as an ideal gas of photons with internal energy per unit volume and pressure if the shell now undergoes an adiabatic expansion the relation between t and r is:

Consider a spherical shell of radius r at temperature t. The black bod

1.	Consider a spherical shell of radius r at temperature t. The black body radiation inside it can be considered as an ideal gas of photons with internal energy per unit volume and pressure if the shell now undergoes an adiabatic expansion the relation between t and r is:
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Consider a spherical shell of radius r at temperature t. The black body radiation inside it can be considered as an ideal gas of photons with internal energy per unit volume and pressure if the shell now undergoes an adiabatic expansion the relation between t and r is:

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