Chapter 17 - Atomic and Nuclear Physics - 1


1. A nucleon is nearly 1832 times havier than an electron


2. Radioactivity was discovered by a French scientist in 1886.


3. The distance travelled by alpha rays emitted by Thorium is 8.62cm.


4. Alpha particles carry a charge twice that of a proton.


5. The ionizing power of alpha rays is very small as compared beta and gamma rays


6. The speed of gamma rays ranges from one percent to 99% that of speed of light.


7. Beta rays produce fluorescence in zinc sulphide.


8. When a neutron emits a beta particle, it changes into a proton.


9. The stable elements can also be changed into unstable form by bombarding them with neutrons.


10. Iodine 131 is used for the study of thyroid glands.


11. In 1905, Newton gave the idea that energy and matter are interchangeable.


12. In the fission reaction, when a nucleus breaks, the sum of masses of produced nuclei and the neutron is equal to the mass of the original nucleus.


13. Fission reaction is used in atomic bomb.


14. If an atom of deuterium is fused with an atom of titrium then alpha particle is formed.


15. More enregy is released in the fission reaction as compared to the fission reaction.


16. The temprature at the surface the sun is 10 million Kelvin.





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