# Atoms and Nuclei-Mass-Energy Relation [NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 1 - 4 of 6

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## Question number: 1

» Atoms and Nuclei » Mass-Energy Relation

### Question

If mass equivalent to one mass of electron is completely converted into energy then determine the energy liberated.

### Choices

Choice (4) | Response | |
---|---|---|

a. | 0.51 MeV | |

b. | 2.12 MeV | |

c. | 1.51 MeV | |

d. | 3.12 MeV |

## Question number: 2

» Atoms and Nuclei » Mass-Energy Relation

### Question

On disintegration of one atom of U ^{235} the amount of energy obtained is 200 MeV. The power obtained in a reactor is 1000 KW. Then

(1) Atoms disintegrated per second in reactor is 3.125 ⨯ 10 ^{16}

(2) Atoms disintegrated per second in reactor is 3.125 ⨯ 10 ^{18}

(3) Decay in mass per hour is 4 ⨯ 10 ^{-8} kg

(4) Decay in mass per hour is 4 ⨯ 10 ^{-6} kg

Select the correct answers and mark it according to the following codes:

### Choices

Choice (4) | Response | |
---|---|---|

a. | 2 and 4 are correct | |

b. | 1 and 3 are correct | |

c. | 1,2 and 3 are correct | |

d. | 1 and 2 are correct |

## Question number: 3

» Atoms and Nuclei » Mass-Energy Relation

### Question

Energy of each photon obtained in the pair production process will be, if the mass of electron or positron is a. m. u-

### Choices

Choice (4) | Response | |
---|---|---|

a. | 0.213 MeV | |

b. | 0.321 MeV | |

c. | 0.465 MeV | |

d. | 0.123 MeV |

## Question number: 4

» Atoms and Nuclei » Mass-Energy Relation

### Question

Sun radiate energy in all direction. The average energy received at earth is 1.4 KW/m ^{2}. The average distance between the earth and the sun is 1.5 ⨯ 10 ^{n} m. If this energy is released by conservation of mass into energy, then the mass lost per day by the sun is approximately (Use l day = 86400 sec)

### Choices

Choice (4) | Response | |
---|---|---|

a. | 4.4 ⨯ 10 | |

b. | 7.6 ⨯ 10 | |

c. | 3.8 ⨯ 10 | |

d. | 3.8 ⨯ 10 |