The energy in eV for light with a wavelength of 6250 angstroms is _. Note - there are 1.6 x 10-12 erg in 1 eV.

2 eV

Explanation:

The energy of a photon of light is given by the formula

where

h is the Planck constant

c is the speed of light

is the wavelength of the photon

In this problem we have:

is the wavelength of the photon

Therefore, the energy in Joules is

We want to convert this energy into electronvolts: we know that the conversion factor is

Therefore,

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.