## Counting Photons (How many astronomers does it take to make a cup of tea?)

Shadow of the Earth or the arch anticrepuscular We thus get an energy scale of 1. Spectrum of solar irradiation. From here, if you know the distance of the earth from the center of the sun, you can calculate the total amount of energy the sun emits in any direction by imaging the area of the sphere with this radius and multiplying by the amount of energy that heat up the can in one second.

Possibly i didn't understand as much as i thought. And then you must add all the photons from the thermal radiation of the earth, which is centered in the IR.

## How many photons are emitted per second by the sun?

Space telescopes. It supplies terrestrial ecosystems via photosynthesis. Join Physics Forums Today! Janus Sr. The answer is that number of photons would scale as , so it would be four times colder!

I remembered that , and that , so with some effort I could get , more or less. Guest posts Conference reports. Then we have the pupil size. The energy that drives these biological reactions is heralded by the arrival of packets of light from space known as photons. Multivariable Calculus Advanced Chemistry About.

### homework and exercises - How many photons does our sun emit in a second? - Physics Stack Exchange

Did you evaluated, during your walk, the geometrical factor of your instrument? The flow of energy in the biosphere. Figure 2: Nice thinking.

Tagged with: As we're talking about a constant energy source at some point your source would not be able to create any photons, it would not have the energy to do so. If you integrate over the yellow spectrum you will have the number of photons within the limits of the spectrum.

The following users thanked this post: We know that the energy of a photon can be calculated according to. With my dobson telescope, which intensifies light by almost 10, times, I could get a rate of a few tens of photons per second, and the detail was indeed detectable!

More the wavelength is shorter, the frequency is high.

### How many photons hit Earth from the Sun? [Archive] - Cosmoquest Forum

If my reading is correct, the figure is for the Sun being directly overhead. Related 5.

Brightness is a representation of more photons striking an area per second. Every light particle ever radiated by galaxies and stars is still travelling, which is why we can peer so far back in time with our telescopes. Classical Physics Search In. Name required. Black holes. The greater part waves reaching us, are those of visible light.