Consider the statments Zi) When an electron falls to a lower energy
level in an atom it emits electromagnetic
radiation.
Z2) The energy of electromagnetic radiation
is directly proportional to its frequency.
Z3) The product of wavelength and the speed
of light is frequency.
Which response includes all statements
that are true, and no others?
1. Z1 and 23 only
2. Z2 and Z3 only
3. Zl only
4. Z1 and Z2 only
5. Z1, Z2 and 23
6. Z2 only