AP Biology
posted by Summer .
How many joules of sunlight hit Earth per day? I have looked everywhere and can't find an answer!!
The sun emits about 4*10^26 Watt. The flux of solar energy at the Earth is thus about:
F = 4*10^26 Watt/(4 pi R^2)
where R = 149.6*10^9 meters is the SunEarth distance:
F = 1422 Watt/m^2
Multiply this by the intercepting cross section of the Earth, which is pi times the square of the radius of the Earth (and *not* 4 pi times radius squared) to obtain the amount of sunlight in joules that hits the Earth per second.
1422 Watt/m^2 * pi (6378*10^3 m)^2 =
1.82*10^17 Joules/second
There are 24*3600 seconds in a day, so about 1.6*10^22 Joules of sunlight hit the Earth per day.
Respond to this Question
Similar Questions

Chem
The best solar panels currently available are about 13% efficient in converting sunlight to electricity. A typical home will use about 40. kWh of electricity a day. Assuming 8 hours of useful sunlight per day, calculate the minimum … 
astrophysics
1) Every second the Sun outputs 3.90* 10^26 Joules of energy. Power is energy output per unit time and is given in units of Watts (W) where 1 W = 1 Joule per second. The Sun's power output is therefore 3.90*10^26 Watts. This is called … 
astrophysics
1) Every second the Sun outputs 3.90* 10^26 Joules of energy. Power is energy output per unit time and is given in units of Watts (W) where 1 W = 1 Joule per second. The Sun's power output is therefore 3.90*10^26 Watts. This is called … 
physics
1. Calculate the speed in m/s at which the Earth revolves about the sun. You may assume the orbit is nearly circular. 2. A satellite is about 6.5 x 10^3 km from the (center of the) Earth. Find its average orbital speed about the Earth. … 
Science
Facts about the sun are? I have 1. the only star in our solar system 2. sun spots are cooler areas on sun's surface 3. from solar energy 4.Solar flares 5. only star you see during the day 6.made of gas 7.closest star to our earth 
Physics
The average energy flux in the sunlight on the Earth is ⟨S⟩=1.4×103 W/m2. You might need to use some of the following constants: Distance from earth to the sun=AU=150×109m REarth=6.4×106m RSun=7.0×108m G=6.67×10−11m3/(kgs2) … 
science
1. What is the alignment of the Earth, moon, and sun during a lunar eclipse? 
science double check answers
1. What is the alignment of the Earth, moon, and sun during a lunar eclipse? 
Physics
The Voyager 1 spacecraft is at the edge of the solar system, about 11 billion km away. (a) How long does a radio signal from Voyager 1 take to get to the Earth? 
Physics
For a I got 36666.67 seconds which I don't know if its right and then b I know my answer is wrong because I got 0.0375 for wavelength.And I don't understand how to do e or f. The Voyager 1 spacecraft is at the edge of the solar …