Question

From the following list of observations, choose the one that most clearly supports the following conclusion:

a)		emission spectrum of hydrogen
b)		diffraction
c)		scattering of alpha particles by metal foil
d)		the photoelectric effect
e)		cathode "rays"

        Electrons in atoms have quantized energies.

a)     observation a

b)     observation b

c)     observation c

d)     observation d

e)     observation e

Answer 1

The conclusion "Electrons in atoms have quantized energies" is supported by the observation A. Emission spectrum of the hydrogen atom. Hence, Option a. is the correct option.

The emission spectra of a hydrogen atom is a result of the jump of an electron from a higher energy level to a lower energy level quantized orbital due to which a certain amount of energy is radiated by the electron (the amount of energy radiated by the electron is equals to the difference of the energy levels it is transferred) which appears as a spectrum. Now, each time you take the H-atom spectra, the same line at similar wavelengths will be produced which shows that the energy levels are of a certain quantized nature.