
Atomic and Particle physics
Authored by Ramnth Tiwari
Physics
12th Grade
Used 4+ times

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23 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The half-life of a radioactive element is 1 day. The initial number of undecayed atoms in a pure sample of this element is 200.
How many undecoyed atoms are there in the sample after 3 days?
0
25
50
100
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The existence of atomic energy levels is supported by:
evidence from emission and absorption spectra.
the Rutherford-Geiger-Mardsen scattering experiment.
observations related to the wave nature of light.
the neutron-to-proton ratio of stable elements.
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following statements about the strong interaction is incorrect?
It is one of the four known fundamental interactions.
Its range is approximately 10-15 m.
It acts on all particles.
It is responsible for binding atomic nuclei.
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following properties is affected when a nucleus decays through gamma-decay?
The proton number of the nucleus
The charge of the nucleus
The neutron number of the nucleus
The energy state of the nucleus
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
On the graph that shows how average binding energy per nucleon varies with nucleon number, the most stable elements can be found:
around the minimum point of the graph.
around the maximum point of the graph.
near the horizontal axis intercept.
near the vertical axis intercept.
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Particle X decays into particle Y. The mediating particle is the W^{+}+. What particles are emitted?
A positron and a neutrino
A positron and an antineutrino
An electron and a neutrino
An electron and an antineutrino
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Consider the following three particles:
I. Electron
II. Electron neutrino
III. Down quark
Which of these particles experience the electromagnetic force?
I and II only
I and III only
II and III only
I, II and III
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