Home
Class 12
PHYSICS
In a large sample of .^(235)U (Which is ...

In a large sample of `.^(235)U` (Which is alpha active)

A

the probability of a nucleus disintegrating during one second is lower in first half life and greater in `2^(nd)` half life.

B

the probability of a nucleus to decay during one sec remains constant for all time.

C

an appreciable quantity of `.^(235)U` remain undecayed even after average life.

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • MODERN PHYSICS - 2

    MOTION|Exercise EXERCISE - 2 (Level -I) OBJECTIVE PROBLEMS - JEE MAIN (SECTION A)|3 Videos

  • MODERN PHYSICS - 2

    MOTION|Exercise EXERCISE - 2 (Level -I) OBJECTIVE PROBLEMS - JEE MAIN (SECTION B)|3 Videos

  • MODERN PHYSICS - 2

    MOTION|Exercise EXERCISE - 1 OBJECTIVE PROBLEMS - JEE MAIN (SECTION C)|6 Videos

  • MODERN PHYSICS

    MOTION|Exercise PHYSICS|73 Videos

  • MODERN PHYSICS -1

    MOTION|Exercise EXERCISE-4 ( LEVEL- II)|39 Videos

Similar Questions

Explore conceptually related problems

The alpha activity of a 10 kg sample of ._(92)U^(235) that is used in a nuclear reactor is found to be x xx 10^(-8) Bq. If the half of life of uranium - 235 for emitting alpha particles is 7.04xx10^(8) year, then find the value 'x' . (Given 1 year =3.15xx10^(7)s )

The half life of ._92U^(238) against alpha decay is 1.5xx10^(17)s . What is the activity of the sample of ._92U^(238) having 2.5xx10^(21) atom?

A nuclear reactor using .^(235)U generates 250 MW of electric power. The efficiency of the reactor (i.e., efficiency of conversion of thermal energy into electrical energy) is 25% . What is the amount of .^(235)U used in the reactor per year? The thermal energy released per fission of .^(235)U is 200 MeV .

._(235)^(239)Pu._(94) is undergoing alpha-decay according to the equation ._(94)^(235)Pu rarr (._(97)^(235)U) +._2^4 He . The energy released in the process is mostly kinetic energy of the alpha -particle. However, a part of the energy is released as gamma rays. What is the speed of the emiited alpha -particle if the gamma rays radiated out have energy of 0.90 MeV ? Given: Mass of ._(94)^(239)Pu =239.05122 u , mass of (._(97)^(235)U)=235.04299 u and mass of ._1^4He =4.002602 u (1u =931 MeV) .

Assuming that the splitting of a U^(235) nucleus liberates of U^(235) isotope, and the mass of cal with calorific value of 30 kJ//g which is equivalent to that the to that for one kg of U^(235) , (b) the mass of U^(235) isotope split during the explosion of the atomic bomb with 30 kt trotyl equivalent if the calorific value of troty is 4.1 k J//g .

Decay of ""_(92)U^(235) is ……order reaction.