What happens to force when area is doubled?

Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?

The discovery of the electron as a subatomic particle was a result of

Which property is expressed in distance units? o a. period o b. wavelength o c. speed o d. frequency