Tag: nuclear physics

Quizzes (6) Questions (198)

Questions Related to nuclear physics

Multiple choice physics nuclear physics beta decay change in nucleus due to radioactive decay alpha, beta and gamma particles (rays) and their properties

A positron is emitted from $\mathrm{N}\mathrm{a} _{11}^{23}$. The ratio of the atomic mass and atomic number of the resulting nuclide is

  1. $22/10$
  2. $22/11$
  3. $23/10$
  4. $23/12$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When a positron is emitted from nucleus, proton will convert into a neutron. So atomic number will be decrease by one  but atomic mass will be constant. 

Thus, atomic mass / atomic number $=23/(11-1)=23/10 $

Multiple choice physics nuclear physics beta decay change in nucleus due to radioactive decay alpha, beta and gamma particles (rays) and their properties

Masses of two isobars $ _{29}^{64}\textrm{Cu}$ and $ _{30}^{64}\textrm{Zn}$ are $63.9298 amu$ and $63.9292 amu$ respectively. It can be concluded from these data that 

  1. Both the isobars are stable
  2. $^{64}Zn$ is radioactive, decaying to $^{64}Cu$ through $\beta -$ decay
  3. $^{64}Cu$ is radioactive, decaying to $^{64}Zn$ through $\lambda -$ decay
  4. $^{64}Cu$ is radioactive, decaying to $^{64}Zn$ through $\beta -$ decay
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Since mass of the isobar has decreased, an electron has been ejected.

Thus $^{64} _{29}Cu$ decays to $^{64} _{30}Zn$ through the $\beta - $ decay as-
$^{64} _{29}Cu\rightarrow^{64} _{30}Zn+^{0} _{-1}e$

Multiple choice chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

In nuclear reactor, Cadmium rods are used as

  1. Fuel

  2. Moderator

  3. Control Rods

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cadmium, Boron and Steel rods are used as control rods in a nuclear reactor.
Commonly moderators are Heavy water, graphite and Beryllium and Berillium oride.
Common fuels are Uranium $(^{238}U)$, enriched Uranium $(^{235}U)$ and plutonium $(^{236}{Pu})$ and $^{232}{Th}$

Multiple choice chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

Boron rods in a nuclear reactor are used to 

  1. absorb excess neutrons

  2. absorb alpha particle

  3. slow down the reaction

  4. speed up the reaction
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
When a neutron collides with the uranium atom, then energy is released along with three more neutrons which further collide with another uranium atom an so the chain reaction continues. Thus boron rods in nuclear reactor are used to absorb excess neutrons so that the reaction rate remains under control.