Home
Class 12
PHYSICS
Fusion processes, like combining two deu...

Fusion processes, like combining two deuterons to form a `He` nucleus are impossible at ordinary temperature and pressure. The reasons for this can be traced to the fact:

A

nuclear forces have short range.

B

nuclei are positively charged.

C

the original nuclei must be completely ionized before fusion can take place.

D

the original nuclei must first break up before combining with each other.

Text Solution

Verified by Experts

The correct Answer is:
A, B
To fuse nuclei, their must be very small from each other. At ordinary temperature and pressure, coulomb repulsine forces between the nuclei dominate over nuclear forces.
(since the latter is short ranged)
Promotional Banner

Topper's Solved these Questions

  • NUCLEAR PHYSICS

    NARAYNA|Exercise Previous JEE questions|21 Videos

  • NUCLEAR PHYSICS

    NARAYNA|Exercise LEVEL-I-(H.W)|16 Videos

  • NUCLEAR PHYSICS

    NARAYNA|Exercise Level-V Multiple answer questions|45 Videos

  • MOVING CHARGES AND MAGNETISM

    NARAYNA|Exercise EXERCISE - 4|20 Videos

  • NUCLEI

    NARAYNA|Exercise ASSERTION & REASON|5 Videos

Similar Questions

Explore conceptually related problems

The process of combining of two lighter nuclei to form a large nucleus accompanied by release of huge amount of energy is called nuclear___

Radioactive disintegration is a first order reaction and its rate depends only upon the nature of nucleus and does not depend upon external factors like temperature and pressure. The rate of radioactive disintegration (Activity) is represented as -(dN)/(dt)=lambdaN Where lambda= decay constant, N= number of nuclei at time t, N_(0) =intial no. of nuclei. The above equation after integration can be represented as lambda=(2.303)/(t)log((N_(0))/(N)) Calculate the half-life period of a radioactive element which remains only 1//16 of its original amount in 4740 years:

Radioactive disintegration is a first order reaction and its rate depends only upon the nature of nucleus and does not depend upon external factors like temperature and pressure. The rate of radioactive disintegration (Activity) is represented as -(dN)/(dt)=lambdaN Where lambda= decay constant, N= number of nuclei at time t, N_(0) =intial no. of nuclei. The above equation after integration can be represented as lambda=(2.303)/(t)log((N_(0))/(N)) What is the activity in Ci (curie) of 1.0mole plutonium -239 ? (t_(1//2)=24000 yeasrs)

Radioactive disintegration is a first order reaction and its rate depends only upon the nature of nucleus and does not depend upon external factors like temperature and pressure. The rate of radioactive disintegration (Activity) is represented as -(dN)/(dt)=lambdaN Where lambda= decay constant, N= number of nuclei at time t, N_(0) =intial no. of nuclei. The above equation after integration can be represented as lambda=(2.303)/(t)log((N_(0))/(N)) Half-life period of U^(2.5xx10^(5) years. In how much thime will the amount of U^(237) remaining be only 25% of the original amount ?

Each phase of a material can exits only in certain regions of pressure and temperature . P-T phase diagrams, in which pressure is plotted versus temperature, show the regions corresponding to various phases and phase transformations . P-V diagrams, on the other hand , can be used to study pressure volume relationship at a constant temperature. If the liquid and gaseous phases of a pure substances are heated together in a closed container, both the temperature and the vapor pressure will increase until a point is reached at which the two phases can no longer be distinguished from one another. The temperature and pressure at which this occurs are called the critical temperature and pressure. Exceeding either of these parameters, by itself ,will cause the "gas"//"liguid" phase transition to disappear. if the other variable is then changed as well, while the first variable is maintained above its critical point , a gradual transition will occur between the gaseous and liquid phases, with no clear boundary.(The liquid and solid phases, on the other hand , maintain a distinct boundary at all pressure above the triple point). Shown in figure is a combined P-T phase diagram for material A and B . If heat is added to solids A and B , each in a container that is open to the atmosphere :-

Each phase of a material can exits only in certain regions of pressure and temperature . P-T phase diagrams, in which pressure is plotted versus temperature, show the regions corresponding to various phases and phase transformations . P-V diagrams, on the other hand , can be used to study pressure volume relationship at a constant temperature. If the liquid and gaseous phases of a pure substances are heated together in a closed container, both the temperature and the vapor pressure will increase until a point is reached at which the two phases can no longer be distinguished from one another. The temperature and pressure at which this occurs are called the critical temperature and pressure. Exceeding either of these parameters, by itself ,will cause the "gas"//"liguid" phase transition to disappear. if the other variable is then changed as well, while the first variable is maintained above its critical point , a gradual transition will occur between the gaseous and liquid phases, with no clear boundary.(The liquid and solid phases, on the other hand , maintain a distinct boundary at all pressure above the triple point). Shown in figure is a combined P-T phase diagram for material A and B . Which is true about the substance in figure?

Two lithium nuclei in a lithium vapour at room temperature do not combine to form a carbon nucleus because

Two identical soap bubbles each of radius r and of the same surface tension T combine to form a new soap bubble of radius R . The two bubbles contain air at the same temperature. If the atmospheric pressure is p_(0) then find the surface tension T of the soap solution in terms of p_(0) , r and R . Assume process is isothermal.

NARAYNA-NUCLEAR PHYSICS-NCERT Based question
  1. Heavy stable nuclei have more neutrons than protons. This is because o...

    Text Solution

    |

  2. In a nuclear reactor, moderators slow down the neutrons which come out...

    Text Solution

    |

  3. Fusion processes, like combining two deuterons to form a He nucleus ar...

    Text Solution

    |

  4. Sample of two radioactive nuclides A and B are taken. lambda(A) and la...

    Text Solution

    |

  5. The variation of decay rate of two radioactive samples A and B with ti...

    Text Solution

    |

  6. He(2)^(3) and He(1)^(3) nuclei have the same mass number. Do they have...

    Text Solution

    |

  7. Draw a graph showing the variation of decay rate with number of active...

    Text Solution

    |

  8. Which sample A or B shown in figure has shorter mean-life ?

    Text Solution

    |

  9. Heavy stable nuclei have more neutrons than protons. This is because o...

    Text Solution

    |

  10. Consider a radioactive nucleus A which decays to a stable nucleus C th...

    Text Solution

    |

  11. Two radioactive materials X(1) and X(2) have decay constant 11 lambda ...

    Text Solution

    |

  12. Radon 220 decays to Bismuth 212 by the following series of decay {:(...

    Text Solution

    |

  13. Find the half life of U^(238), if one gram of it emits 1.24xx10^4 alp...

    Text Solution

    |

  14. What is the age of an ancient wooden piece if it is known that the spe...

    Text Solution

    |

  15. In the uranium ore, the ratio of U^(238) nuclei to Pb^(206) nuclei is ...

    Text Solution

    |

  16. The specific activity of a preparation consisting of radioactive Co^(5...

    Text Solution

    |

  17. An unstable element is produced in nuclear reaction at a constant rate...

    Text Solution

    |

  18. Two identical samples (same material and same amout) P and Q of a radi...

    Text Solution

    |

  19. A radionuclide is produced at constant rate 'q' having half life T. Fi...

    Text Solution

    |

  20. In an agriculture experiment, a solution containing 1 mole of a radioa...

    Text Solution

    |