When the tube is filled with mercury vapor, as in this case, a sharp drop in the collected current is observed when the accelerating potential reaches 4.9 . the current drops suddenly to a negligible value and slowly increases again when the accelerating potential is above 4.9 . what is the energy absorbed by the atomic electrons in the mercury atom when the accelerating potential is 4.9 ?
b) the excited mercury atoms decay back to the lowest energy level by emitting radiation. what is the wavelength of this radiation?

253.54 nm

Explanation:

h = Planck's constant =

c = Speed of light =

= Wavelength

V = Voltage = 4.9 V

The loss in kinetic energy = Gain in potential energy (energy conservation)

Energy is given by

The wavelength is 253.54 nm

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where is the photo and the answer choices?