Home
Class 12
PHYSICS
When the sun is directly overhead, the s...

When the sun is directly overhead, the surface of the earth receives 1.4 xx `(10^3) W (m^-2)` of sunlight. Assume that the light is monochromatic with average wavelength 500mn and that no light is absorbed in between the sun and the earth's surface. The distance between the sun and the earth is 1.5 xx `(10^11)` m. (a) Calculate the number of photons falling per second on each square metre of earth's surface directly below the sun. (b) How many photons are there in each cubic metre near the earth's surface at any instant? (c) How many photons does the sun emit per second?

Promotional Banner

Similar Questions

Explore conceptually related problems

If the distance between the sun and the earth is 1.5xx10^(11) m and velocity of light is 3xx10^(8) m//s , then the time taken by a light ray to reach the earth from the sun is

The total luminosity of the sun is 3.9xx10^(26)W . The mean distance of the sun from the earth is 1.496xx10^(11)m . Calculate the value of solar constant.

Find the luminous intensity of the sun if it produces the same illuminance on the earth as produced by a bulb of 10000 candela at a distance 0.3 m . The distance between the sun and the earth is 1.5 xx 10^(11) m

The angular diameter of the sun is 1920". If the distance of the sun from the earth is 1.5xx10^(11) m, what is the linear diameter of the sun ?

The angular diameter of the sun is 1920''. If the distance of the sun from the earth is 1.5xx10^(11)m , what is the linear diameter of the sun?

The angular diameter of the sun is 1920". If the distance of the sun from the earth is 1.5xx10^(11) m, what is the linear diameter of the sun ?

Estimate the mass of the sun, assuming the orbit of the earth round the sun to be a circle. The distance between the sun and earth is 1.49 xx 10^(11) m and G = 6.66 × 10^(-11) Nm^(2)//kg^(2) .

The time taken by the earth to complete one revolution around the sun is 3.156 xx 10^(7) s . The distance between the earth and the sun is 1.5 xx 10^(11) m. Find the speed of revolution of the earth.

The energy from the sun reaches just outside the earth's atmoshphere at a rate of 1400 W m^(-2) . The distance between the sun and the earth is 1.5 xx 10^(11) m . (a) Calculate the rate at which the sum is losing its mass. (b) How long will the sun last assuming a constant decay at this rate? The present mass of the sun is 2 xx 10^(30) kg