[" The intensity of solar "],[" radiation at the earth's "],[" surface is "1KWm^(-2)" .The power "],[" entering the pupil of an eye "],[" of diameter "0.5cm" is "],[qquad mw]

The intensity of solar radiation of the earths surface is 1KWm^(-2) . The power entering the pupil of an eye of diameter 0.5 cm is

Average distance of the sun from the earth is 1.5xx10^8 km and the average intensity of sunlight incident on the earth's surface is 1300 W . m^(-2) . Calculate the energy radiated per second from the surface of the sun.

Average intensity of the solar energy incident on the earth's surface is 1300 W.m^(-2) . Calculate the rms values of electric and magnetic fields due to this radiation near the earth's surface. (Given mu_0=4pixx10^(-7)H.m^(-1) )

The intensity of solar radiation just outside the earth's atmosphere is measured to be 1.4 kW//m^2 . If the radius of the sun 7xx10^8m , while the earth-sun distance is 150xx10^6km , then find i. the intensity of salr radiation at the surface of the sun. ii. the temperature at the surface of the sun assuming it to be a black body, iii. the most probable wavelength in solar radiation.

The intensity of salr radiation just outside the earth's atmosphere is measured to be 1.4 kW//m^2 . If the radius of the sun 7xx10^8m , while the earth-sun distance is 150xx10^6km , then find i. the intensity of salr radiation at the surface of the sun. ii. the temperature at the surface of the sun assuming it to be a black body, iii. the most probable wavelength in solar radiation.

A normal human eye can detect yellow light if more than 10 photons enter into it per second. A star is generating as much power as the Sun and is emitting predominantly yellow light (lambda = 6000 Å) . How far is the star if our eye isbarely able to see it? It is given that intensity of solar light on surface of the earth is I = 1400 Wm^(– 2) and the distance of the Sun from the Earth is r = 1.5 × 10^(11) m . The diameter of pupil of our eye is d = 6 mm .

Solar constant, I_(s) is defined as intensity of solar radiation incident on the Earth. Its value is close to 1.4 kW//m^(2) . Nearly 68% of this energy is absorbed by the Earth. The average temperature of Earth is about 290 K. Radius of the Earth is R_(e) = 6000 km and that of the Sun is R_(s) = 700,000 km . Earth - Sun distance is r = 1.5 xx 10_(8) km . Assume Sun to be a black body. (a) Estimate the effective emissivity of earth. (b) Find the power of the sun. (c) Estimate the surface temperature of the Sun.