12th Physics Important 3 Marks Questions. We covered all the 12th Physics Important 3 Marks Questions in this post for free so that you can practice well for the exam.
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12th Physics Important 3 Marks Objective Questions for Students
The number of nodes in the ground state wave function of a particle in an infinite square well is
a. 2
b. 1
c. 0
d. 4
Option a – 2
Polonium has a half-life of 140 days. How much polonium will disintegrate in 280 days if the original amount is 20g?
a. 15 g
b. 20 g
c. 10 g
d. 12 g
Option a – 15 g
7/8 part of an artificial radioactive element decays in 168 sec. What is its half-life?
a. 56 sec
b. 60 sec
c. 32 sec
d. 50 sec
Option a – 56 sec
If an X-ray tube is operated at 24,824 volts, what is the minimum wavelength of X-rays?
a. 0.5 Å nearly
b. 1 Å
c. 2 Å
d. 4 Å
Option a – 0.5 Å nearly
What is the smallest wavelength of the Lyman series in hydrogen?
a. 912 Å
b. 600 Å
c. 100 Å
d. 1000 Å
Option a – 912 Å
Calculate the energy of an electron in the ground state of the H-atom.
a. -13.6 eV
b. 13.6 eV
c. 1.36 eV
d. none of these
Option a – -13.6 eV
For a stationary state, the probability density is
a. independent of time
b. function of time
c. independent space coordinates
d. none of the above
Option a – independent of time
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