Home
Class 11
PHYSICS
The light from the sun is found to have ...

The light from the sun is found to have a maximum intensity near the wavelength of 470nm. Assuming that the surface o f the sun emits as a black body, calculate the temperature of the surface of the sun.

Text Solution

Verified by Experts

For a blackbody, `lambda_(m)T=0.288cmK` .thus, `T=(0.288cmK)/(470nm)=6130K`.
Promotional Banner

Similar Questions

Explore conceptually related problems

A black body emits radiations of maximum intensity at wavelength of 5000Å When the temperature of the body is 1227^(@)C . If the temperature of the body is increased by 1000^(@)C , the maximum intensity of emitted radiation would be observed at . . . . . . .

Two bodies A and B have thermal emissivities of 0.01 and 0.81 respectively. The outer surface areas of the two bodies are same. The two bodies emit total radiant power at the same rate. The wavelength lambda_B corresponding to maximum spectral radiancy from B is shifted from the wavelength corresponding to maximum spectral radiancy in the radiation from A by 1.0 mum . If the temperature of A is 5802 K, calculate (a) the temperature of B, (b) wavelength lambda_B .

Write the temperature of surfaces of Moon and Sun according to Wien's law.

A photoelectric surface is illuminated successively by monochromatic light of wavelength lambda and (lambda)/(2) .If the maximum kinetic energy of the emitted photoelectrons in the second case is 3 times in the first case,the work function of the surface of the material is: (h=Plank's constant ,c=speed of light)

On observing light from three different stars P, Q and R, it was found that intensity of violet color is maximum in the spectrum of P, the intensity of green colour is maximum in the spectrum of R and the intensity of red colour is maximum in the spectrum of Q. If T_(P),T_(Q) and T_(R) are the respective absolute temperatures of P,Q and R, then it can be concluded from the above observation that :

The solar constant for the earth is s . The surface temperature of the sun is T K . The sun subtends an angle theta at the earth :-

Calculate the temperature of the black body from given graph when wavelength is maximum.

A black body emits radiation at the rate P when its temperature is T. At this temperature the wavelength at which the radiation has maximum intensity is lamda_0 , If at another temperature T' the power radiated is P' and wavelength at maximum intensity is (lamda_0)/(2) then

A point sources S emitting light of wavelength 600nm is placed at a very small height h above the flat reflecting surface AB (see figure).The intensity of the reflected light is 36% of the intensity.interference firnges are observed on a screen placed parallel to the reflecting surface a very large distance D from it. (A)What is the shape of the interference fringes on the screen? (B)Calculate the ratio of the minimum to the maximum to the maximum intensities in the interference fringes fromed near the point P (shown in the figure) (c) if the intenstities at point P corresponds to a maximum,calculate the minimum distance through which the reflecting surface AB should be shifted so that the intensity at P again becomes maximum.

White light consisting of wavelengths 380 nm le lambda le 750 nm is incident on a lead surface. For which one of the following ranges of wavelength will photoelectrons be emitted from the lead surface that has a work function W_(0) = 6.63 xx 10^(-29) J ?