List of top Physics Questions on radiation asked in MHT CET

If the absolute temperature of a black body is doubled, the frequency corresponding to maximum emissive power becomes:

If a star \(A\) has radiant power three times that of the Sun and a temperature of \(6000\,K\) while the Sun has temperature \(2000\,K\), what is the ratio of their radii \((R_A : R_{Sun})\)?

The co-efficient of absorption and the coefficient of reflection of a thin uniform plate are $0.77$ and $0.17$ respectively. If $250 \text{ kcal}$ of heat is incident on the surface of the plate, the quantity of heat transmitted is

A star radiates heat as a black body at temperature ' (T) '. The total radiant energy per unit area received at a distance ' (R) ' from the centre of a star of radius ' (r) ' is : ((\sigma =) Stefan's constant)

A parallel beam of light is incident normally on a plane surface absorbing 50% of the light and reflecting the rest. If the incident beam carries $90\text{ W}$ of power, the force exerted by it on the surface is ( $\text{C} =$ velocity of light in air $= 3 \times 10^8\text{ m/s}$ )}

For a perfectly black body, coefficient of emission is

A star radiates heat as a black body at temperature ' (T) '. The total radiant energy per unit area received at a distance ' (R) ' from the centre of a star of radius ' (r) ' is : ((\sigma =) Stefan's constant)

The co-efficient of absorption and the coefficient of reflection of a thin uniform plate are $0.77$ and $0.17$ respectively. If $250 \text{ kcal}$ of heat is incident on the surface of the plate, the quantity of heat transmitted is

A star radiates heat as a black body at temperature ' (T) '. The total radiant energy per unit area received at a distance ' (R) ' from the centre of a star of radius ' (r) ' is : ((\sigma =) Stefan's constant)

Two black bodies emit the same amount of radiation per second. The radius of the first is \( R_1 = 2 \, \text{m} \) and its temperature is \( T_1 = 400 \, \text{K} \). If the second body has a radius \( R_2 = 4 \, \text{m} \), what is its temperature \( T_2 \) in Kelvin?

A spherical body of radius ' \(r\) ' radiates power ' \(P\) ' at \(T\) kelvin. If the radius is halved and the temperature doubled the power radiated in the same time ' \(t\) ' will be

A blackbody at \( 1227^\circ\text{C} \) emits radiation with maximum intensity at a wavelength of \( 5600\,\text{\AA} \). If the temperature of the body is increased by \( 1000^\circ\text{C} \), the maximum intensity will be at wavelength

A star 'A' has radiant power equal to 3 times that of the Sun. The temperature of star 'A' is \( 6000 \, \mathrm{K} \) and that of the Sun is \( 2000 \, \mathrm{K} \). What is the ratio of their radii?

A spherical body of radius ' \(r\) ' radiates power ' \(P\) ' at \(T\) kelvin. If the radius is halved and the temperature doubled the power radiated in the same time ' \(t\) ' will be

A body is said to be opaque to the radiation if $(a,r,t)$ are coefficient of absorption, reflection and transmission respectively.