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What is the velocity of an electron in the 3rd orbit of hydrogen atom if its velocity in the 1st orbit is v0?
Concept: Bohr’s Model for Hydrogen Atom
Radius of the 1st orbit of hydrogen atom is r0. What will be the radius of the 4th orbit?
Concept: Alpha-particle Scattering and Rutherford’s Nuclear Model of Atom
The de Broglie wavelength of an electron in the first Bohr’s orbit of hydrogen atom is equal to ______.
Concept: Bohr’s Model for Hydrogen Atom
During Rutherford’s gold foil experiment, it was observed that most of the α-particles did not deflect. However, some showed a deflection of 180°.
What hypothesis was made to justify the deflection of α-particle by 180°?
Concept: Alpha-particle Scattering and Rutherford’s Nuclear Model of Atom
Name a material which is used in making control rods in a nuclear reactor.
Concept: Atomic Masses and Composition of Nucleus
Write one balanced equation to show Nuclear fusion
Concept: Nuclear Fusion
Write one balanced equation to show Emission of `beta^-` (i.e. a negative beta particle)
Concept: Atomic Masses and Composition of Nucleus
With the help of a suitable example and an equation, explain the term pair production.
Concept: Atomic Masses and Composition of Nucleus
Write one balanced reaction representing nuclear fusion.
Concept: Nuclear Fusion
In a nuclear reactor, what is the function of a moderator?
Concept: Nuclear Fusion
In our Nature, where is the nuclear fusion reaction taking place continuously?
Concept: Nuclear Fusion
The atomic mass of Uranium `""_92^238"U"` is 238.0508 u, while that of Thorium `""_90^234"Th"` is 234.0436u, and that of Helium `""_2^4"He"` "is 4.0026u. Alpha decay converts `""_92^238"U"` into `""_92^234"Th"` as, shown below:
`""_92^238"U" -> ( ""_90^234"Th" + ""_2^4"He" + "Energy" )`
Concept: Atomic Masses and Composition of Nucleus
What is a neutrino?
Concept: Atomic Masses and Composition of Nucleus
Read the passage given below and answer the questions that follow.
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Mr. Ravi had been living in a small town with his family for many years. He decided to shift to a city when he learnt that a nuclear power plant would be built in his town. His son Prakash, who was a science teacher, did not agree with his father’s decision. Prakash explained to his father how mass defects during nuclear fission released energy. He assured his father that the authorities were taking all the possible safety measures to avoid any kind of nuclear mishap. Mr. Ravi understood the scientific explanation given by his son and decided not to shift to another place. |
- What is the cause of energy generation of a nuclear reactor during nuclear fission?
- Write one nuclear reaction for nuclear fission that takes place in a nuclear reactor.
- Give the formula for the energy generation that takes place in the nuclear reactor.
Concept: Nuclear Reactions
What conclusion is drawn from Rutherford’s scattering experiment of α-particles?
Concept: Atomic Masses and Composition of Nucleus
Name the type of nuclear reaction that takes place in the core of the Sun.
Concept: Nuclear Reactions
In a nuclear reactor, state the use of graphite rods.
Concept: Nuclear Reactions
In a nuclear reactor, state the use of cadmium rods.
Concept: Nuclear Reactions
Calculate the energy released in the following nuclear fusion reaction:
\[\ce{^2_1H + ^2_1H -> ^4_2He + energy}\]
Mass of \[\ce{^2_1H = 2.014102 u}\]
Mass of \[\ce{^4_2He = 4.002604 u}\]
Concept: Nuclear Reactions
Find the energy released during the following fission reaction.
\[\ce{_92^235U + _0^1n-> _92^236U->_36^90Kr + _56^143Ba + 3 _0^1n}\]
| Mass(u) | |
| 235U | 235.0439 |
| 90Kr | 89.9195 |
| 143Ba | 142.9206 |
| 1n | 1.0087 |
Concept: Nuclear Reactions
