Assertion: Static crashes are heard on radio, when lightning flash occurs in the sky.
Reason: Electromagnetic waves having frequency of radio wave range interfere with radio waves.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: γ-radiation emission occurs after decay.
Reason: Energy levels occur in nucleus.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
A.
If both assertion and reason are true and reason is the correct explanation of assertion.
Most of times β decay leaves the daughter nucleus in an excited state. It excites itself by emitting gamma rays. Sometimes α- decay also leaves daughter nucleus in an excited state causing emission of gamma rays. Like atoms, nuclei also have energy lavels and gamma rays arise because of transitions between these levels.
Gamma radiation often occurs straight after alpha or beta decay. The child nuclide formed often has excess energy which is released by gamma emission.
In nuclear fission, which of the following quantity is conserved?
Energy
Mass
Momentum
Both energy and mass
When a slow neutron is captured by a nucleus, a fission energy releasing 200 MeV. If power of nuclear reactor is 100 W then rate of nuclear fission is
3.6 × 106 s-1
3.1 × 1012 s-1
1.8 × 104 s-1
4.1 × 106 s-1
Which of the following statement is incorrect?
Neutron is less stable than proton
Neutron can cause fission in nuclear reactors but proton can not.
A free proton can emit beta particle.
A bound proton can emit beta particle.
Electric field at a distance r from infinitely long conducting sheet is proportional to
r-1
r-2
r-3/2
independent of r
In beta plus decay
antineutrino is produced with electron
neutrino is produced with positron
neutron is produced with electron
none of these
Assertion: is a source of gamma radiation.
Reason: Gamma emission is due to nuclear decay.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Gamma decay takes place
Prior to alpha decay.
Prior to beta decay.
Prior to positron decay.
Due to de-excitment of nuclear levels.