The sum radiates electromagnetic energy at the rate of 4.0 ×10^26 W. Its radius is 7 ×10^8 m.

step 1 So here in this question, it has been asked to find out the intensity of sunlight with the solar

The sum radiates electromagnetic energy at the rate of 4.0...

The sum radiates electromagnetic energy at the rate of $4.0 \times 10^{26} \mathrm{~W}$. Its radius is $7 \times 10^{8} \mathrm{~m}$. The intensity of sun light at the solar surface is (a) $4.54 \times 10^{8} \mathrm{Wm}^{-2}$ (b) $5.09 \times 10^{-8} \mathrm{Wm}^{-2}$ (c) $3.00 \times 10^{8} \mathrm{Wm}^{-2}$ (d) $10^{\mathrm{E}} \mathrm{Wm}^{-1}$

The sum radiates electromagnetic energy at the rate of $4.0 \times 10^{26} \mathrm{~W}$. Its radius is $7 \times 10^{8} \mathrm{~m}$. The intensity of sun light at the solar surface is
(a) $4.54 \times 10^{8} \mathrm{Wm}^{-2}$
(b) $5.09 \times 10^{-8} \mathrm{Wm}^{-2}$
(c) $3.00 \times 10^{8} \mathrm{Wm}^{-2}$
(d) $10^{\mathrm{E}} \mathrm{Wm}^{-1}$

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Key Concepts

Luminosity

Luminosity is the total amount of energy an object radiates per unit time, typically measured in watts. It represents the overall energy output of a star or other radiating body, independent of the distance from the observer.

Intensity (Flux Density)

Intensity, also known as flux density, is the power received per unit area. It is calculated by dividing the total emitted power by the surface area over which that power is spread, providing a measure of how concentrated the energy is at a particular location.

Spherical Surface Area

The surface area of a sphere is given by the formula 4?r², where r is the radius of the sphere. This concept is essential when working with isotropic radiation, as it determines how the emitted energy is distributed over the sphere surrounding the source.

Inverse Square Law

The inverse square law states that the intensity of radiation from a point source is inversely proportional to the square of the distance from the source. This law explains how radiation spreads out in space, leading to a decrease in intensity as the distance increases.

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