Electrons in a Certain Laser Make Transitions from a Metastable

question 20

Multiple Choice

Electrons in a certain laser make transitions from a metastable state to the ground state.Initially there are 6*10²⁰ atoms in the metastable state and 2 * 10²⁰ atoms in the ground state.The number of photons that can be produced in a single burst is about:

• A)2 * 10²⁰
• B)3 *10²⁰
• C)4 * 10²⁰
• D)6 *10²⁰
• E)8 * 10²⁰