A photon has a wavelength of 547 nm. Calculate the energy of the photon in joules

                   Energy = 3.63 × 10⁻¹⁹ Joules

Explanation:

                   The energy contained by photon is directly proportional to its frequency and inversely proportional to its wavelength. The smaller the wavelength the greater the energy and vice versa.

The relation between wavelength and energy is as follow,

                                                   E = h c / λ

where

          E = Energy = ?

          h  =  Plank's Constant  =  6.6262 × 10⁻³⁴ Js

          c = velocity of light = 3.0 × 10⁸ ms⁻¹

          λ = wavenumber = 547 nm = 547 × 10⁻⁹ m

Putting the given values,

          E = 6.6262 × 10⁻³⁴ Js × 3.0 × 10⁸ ms⁻¹ / 547 × 10⁻⁹ m

          E = 3.63 × 10⁻¹⁹ Joules

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.