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Chapter 17 - Atomic and Nuclear Physics - 5
1.
Natural radioactivity takes place in the elements having atomic number greater than _________.
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2.
The speed of alpha rays ranges between _________ and _________ m/sec.
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3.
Mass of alpha particles is __________ times of hydrogen atom.
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4.
Speed of beta rays is _________ than alpha rays.
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5.
The penetrating power of gamma rays is much higher than _________ rays.
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6.
Ionizing power of beta rays is ___________ times less than ampha rays.
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7.
Ionizing power of gamma rays is very small as compared to _____ rays.
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8.
Most of the nuclei whose atomic number are from ______ to ________ are stable nuclei.
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9.
To diagnoes the brain tumor, ___________ radio-isotope is used.
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10.
For curing cancerous tumors and cells, radioactive isotope ___________ is used.
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11.
For fusion reaction the required temprature is acheived by exploding a ________ bomb.
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12.
In nuclear reactor surplus neutrons are absorbed by _________ rods.
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13.
In fusion reaction of isotopes of hydrogen , nearly _____ of energy is liberated.
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14.
Energy coming from sun and stars is due to fusion of ________.
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15.
Temperature at the centre of the sun is nearly __________ K
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16.
The radioactive material must be placed in a box of ____________.
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