# Bohr's model and radioactivity online Test

Consider ( particle,( particle and (- rays, each having an energy of 0.5 Me V. In increasing order of penetrating powers, the radiations are:
(.(.(
(.(.(
(.(.(
(.(.(
Energy of 24.6 eV is required to remove one of the electrons from a neutral helium atom. The energy in (eV) required to remove both the electrons from a neutral helium atom is
38.2
49.2
51.8
79.0
A radioactive material decays by simultaneous emission of two particles with respective half-lives 1620 and 810 years. The time, in years, after which one-fourth to the material remains is
1080
2430
3240
4860
Masses of two isobars29 Cu64Zn64 are 63.9298 u and 63.9292 u respectively. It can be concluded from these data that
Both the isobars are stable.
Zn64 is radioactive, decaying to Cu64 through
Cu64 is radioactive, decaying to Zn64 through (-decay
Cu64 is radioactive, decaying to Zn64 through (-decay.
/
If the atom 100Fm257 follows the Bohr model and the radius of 100Fm257 is n times the Bohr radius, then find n.
100
200
4
1/4
The largest wavelength in the ultraviolet region of the hydrogen spectrum is 122 nm. The smallest wavelength in the infrared region of the hydrogen spectrum (to the nearest integer) is
802 nm
823 nm
1882 nm
1648 nm
The electron in a hydrogen atom makes a transition n1( n2 where n1 and n2 are the principal quantum numbers of the two states. Assume the Bohr model to be valid. The time period of the electron in the initial state is eight times that in the final state. The possible values of n1 and n2 are
n1=4, n2=2
n1 =8, n2=2
n1=8, n2=1
n1=6, n2=3
1 and 4
2 and 3
Join the PMT Medical Entrance Exam Community
Description:

The test is on questions from Bohr's model and radioactivity where transition between different energy levels,radioactive decay has been included

Tags:

Want to learn?

or fill this simple form
Name:
Country:
Contact no.:

Area code Number
Subjects you are interested in:
Word verification: (Enter the text as shown in image)

Kajal Sengupta
Physics teacher of 9th to 12 th grade,A, AS level
53 Members Recommend
469 Followers

### More Tests By Author

PHYSICS : REVISION TEST ON TOPICS OF CLASS XII ---XIII
10 Questions | 616 Attempts

PHYSICS : REVISION TEST ON TOPICS OF CLASS XI --XIII
10 Questions | 177 Attempts

PHYSICS : REVISION TEST ON TOPICS OF CLASS XI --XII
10 Questions | 254 Attempts

PHYSICS : REVISION TEST ON TOPICS OF CLASS XI --XI
10 Questions | 275 Attempts

Connect