First slide

Radiation

Question

The maximum energy in thermal radiations from a blackbody occurs at wavelength 4000 Å. The effective temperature of the source is :

Moderate

A

7000 K
B

8000 K
C

$10^{4} K$
D

$10^{8} K$

Solution

$according to Wien' s displacment law λ_{m} T = 2.8 x 10^{- 3} mK T = \frac{2.8 x 10^{- 3}}{4 x 10^{- 7}} = 7000 K$

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