Which of the following properties of a photon are required to calculate the energy emitted by an electron returning to its ground state? A. wavelength
B. frequency
C. either A or B
D. both A and B

C. either A or B

Explanation:

To calculate the energy of a photon returning to its ground state, we required either the frequency or the wavelength. Often times, not both.

The wavelength of a photon can be derived by;

     E = hf

 or

        E  =  

 h is the Planck's constant

 c is the speed of light

 f is the frequency

relative humidity is a measure of the amount of moisture in the air relative to the total amount of moisture the air can hold.

so d