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पूर्व कक्षा का दोहरान |NCERT Ex-1.3|सारांश

पूर्व कक्षा का दोहरान |NCERT Ex-1.3|सारांश

_83^212Bi can disintegrate either by emitting an alpha -particle or by emitting a beta -particle. (a) write the two equations showing the products of the decays. (b) The probabilities of disintergration by alpha and beta -decays are in the ratio 7//13. The overall half-life of ^212Bi is one hour. If 1 g pure ^212Bi is taken at 12.00 noon,what will be the composition of this sample at 1 p.m the same day?

पूर्व कक्षा का दोहरान |NCERT Ex-1.2|सारांश

Assuming the radius of a nucleus to be equal to R=1.3 A^(1//3)xx10^(-15)m . Where A is its mass number, evaluate the density of nuclei and the number of nucleons per unit volume of the nucleus. Take mass of one nucleon =1.67xx10^(-27)kg

Nucleus of an atom resembles with a drop of liquid. Density of nucleus is very high, i.e., 10^(8) tonne/cc or 130 trillion tonnes m^(-3) . This density is about a trillion times greater than that of water. Density of nuclei of all elements are same, it is independent of atomic number or atomic mass. However, the radius of nucleus depends on the mass number . Surface However, the radius of nucleus depends on the mass number. Surface tension of nucleus is also very high. i.e., about 1.24 xx 10^(18) times, the suface tension of water. The radius of ._(6)^(12)C nucleus is: