Suppose the sun was located at the position occupied by the star nearest to us, namely `alpha`- Centauri, which is at a distance of about 14 from us. By what factor would the radiation received per unit area per second at the earth be reduced?

What is the correct sequence in the increasing order of heat energy received per unit area from the Sun measured on Earth, Mars and Jupiter?

The rays of the sun are focused on a piece of ice through a lens of diameter 5 cm , as a result of which 10g ice melts in 10 minutes. The amount of heat received from the sun per unit area per minute is

The rays of the sun are focused on a piece of ice through a lens of diameter 5 cm , as a result of which 10g ice melts in 10 minutes. The amount of heat received from the sun per unit area per minute is

If the amount of heat energy received per unit area from the Sun is measured on Earth Mars and Jupiter it will be .

We know that the Sun is fundamental source of all energy that we use. Huge amount of energy is being produced in the Sun and this energy is radiated all around in the form of electromagnetic waves of several possible wavelengths. We can treat the Sun as a point source because it radiates energy uniformly in all directions. Intensity of wave at a point is defined as amount of energy passing that point per unit time and per unit area. We know that Earth is at a distance approximately 1.5 xx 10^(11) m from the Sun and assume that intensity of radiation of the Sun reaching Earth's surface is 10^3 W/ m^2 . How much energy is being radiated by the sun in one second ?

An isotropic point source emits light with wavelength 589 nm. The radiation power of the source is P = 10 W. (a) Find the number of photons passing through unit area per second at a distance of 2 m from the source. (b) Also calculate the distance between the source and the point where the mean concentration of the photons is 100//cm^(3) .

An isotropic point source emits light with wavelength 589 nm. The radiation power of the source is P = 10 W. (a) Find the number of photons passing through unit area per second at a distance of 2 m from the source. (b) Also calculate the distance between the source and the point where the mean concentration of the photons is 100//cm^(3) .