If t₁ ̷ ₂ is the half-life of a substance, then t₃ ̷ ₄ is the time in which
If t₁ ̷ ₂ is the half-life of a substance, then t₃ ̷ ₄ is the time in which
Options
(a) substance decays 1/2 (b) substance decays (3/4)th (c) substance remains 1/2 (d) […]
Physics
If the half-life of a material is 10 yr, then in what time, it becomes 1/4th part
If the half-life of a material is 10 yr, then in what time, it becomes 1/4th part of the initial amount
Options
(a) 15 yr (b) 20 yr (c) 25 yr (d) 30 […]
A radiactive substance emits 100 beta particles in the first 2s and 50 beta
A radiactive substance emits 100 beta particles in the first 2s and 50 beta particles in the next 2s. The mean life of the sample is
Options
(a) 4 s (b) 2 s […]
A nucleus ᴢXᴬ emits an α- particle with velocity v. The recoil speed of the daughter
A nucleus ᴢXᴬ emits an α- particle with velocity v. The recoil speed of the daughter nucleus is
Options
(a) A-4/4v (b) 4v/A-4 (c) v (d) v/4
Correct Answer:
4v/A-4
Explanation:
According to the […]
Pick out the correct statements from the following
Pick out the correct statements from the following I. Electron emission during β-decay is always accompanied by neutrons II. Nuclear force is charge independent III. Fusion is the chief source of stellar energy
Options […]
The phenomenon of radioactivity
The phenomenon of radioactivity
Options
(a) increases on applied pressure (b) is exothermic change which increases or decreases with temperature (c) is nuclear process which does not depend on external forces (d) None […]
The purpose of using heavy water in nuclear reactor is
The purpose of using heavy water in nuclear reactor is
Options
(a) to increase the energy released in nuclear fission (b) to cool the reactor to room temperature (c) to make the dynamo […]
In radioactive element, β-rays are emitted from
In radioactive element, β-rays are emitted from
Options
(a) Nucleus (b) Outer orbit (c) Inner orbit (d) None of these
Correct Answer:
Nucleus
Explanation:
β-rays are emitted from nucleus.
A U²³⁵ reactor generates power at a rate of P producing 2×10⁸ fission per second.
A U²³⁵ reactor generates power at a rate of P producing 2×10⁸ fission per second. The energy released per fission is 185 MeV. The value of P is
Options
(a) 59.2 MW (b) […]
When ₉₀Th²²⁸ transforms to ₈₃Bi²¹², the number of emitted α and β particles
When ₉₀Th²²⁸ transforms to ₈₃Bi²¹², the number of emitted α and β particles are respectively
Options
(a) 8 α,7 β (b) 4 α,7 β (c) 4 α,4 β (d) 4 α,1 β
Correct Answer: […]