have a pretty basic chem problem about lights and radiation

[kevinf]

An instrument can detect 9450 photons of light of wavelength of 8.065 × 10^-8 m. What is the minimum amount of energy in J to which the instrument is sensitive? Express answer in scientific notation..

i have tried to use the e = (planck's constant) ( speed of light ) / (wavelenghth) but i am not sure how the photons figure is used

[Borek]

If one photon carries 10-18 J of energy, how much energy is carried by two identical photons?

[kevinf]

where did you get 10^-18

[Borek]

Nowhere, it is not directly related to the question. I could as well ask "If one photon carries 1018 J of energy, how much energy is carried by two identical photons?", although that'll be quite a photon :bugeye:

[kevinf]

so how would i know how much energy does each photon carry

[Borek]

You have already listed equation that allows calculation of the energy of a single photon.

[kevinf]

so would i plug the wavelength into the equation and multiply by the number of photons and get my answer?

[Borek]

Exactly.