Category: Atomic Spectra

A. Cathode rays
B. Positive rays
C. γ-rays
D. Beta rays

A. photo electric effect
B. ionization
C. shadow photograph
D. any of above

A. 18.336
B. 1836
C. 18360
D. 183.6

A. applied voltage
B. frequency
C. source
D. all of the above

A. Stimulated
B. Absorbed
C. Cause X-ray emission
D. Cause laser production

A. 13.60 eV
B. 3.40 eV
C. 0.85 eV
D. 1.51 eV

A. Ke2/rn
B. Ke2/rn2
C. ÀKe2/rn
D. ÀKe2/rn2

A. It does emit radiation
B. Its size as compare to proton and neutron is very small
C. No antiparticle of electron is present
D. The velocity of electron must be very high according to uncertainty principle

A. an atom has limited number of ionization potentials but a large number of excitation potentials
B. there are as many excitation potentials as there are excited states
C. the difference between the energy of the ground sate and any one of the excited states is the measure of excitation energy
D. all of above

A. The illumination of the target metal by ultra-violet radiation
B. The bombardment of the target by protons
C. The bombardment of target by electrons
D. The absorption of radiation by the target metal