Advertisements
Advertisements
प्रश्न
James Chadwick, in 1932 studied the emission of neutral radiations when Beryllium nuclei were bombarded with alpha particles. He concluded that emitted radiations were neutrons and not photons. Explain.
Advertisements
उत्तर
In 1932 James Chadwick observed the emission of neutral radiation when beryllium nuclei were bombarded with alpha-particles. It was found that this neutral radiation could knock out protons from light nuclei such as those of helium, carbon and nitrogen. The only neutral radiation known at that time was photons. Application of the principles of conservation of energy and momentum showed that if the neutral radiation consisted of photons, the energy of photons would have to be much higher than is available from the bombardment of beryllium nuclei with α-particles. So, Chadwick assumed that neutral radiation consists of a new type of neutral particle called neutrons.
APPEARS IN
संबंधित प्रश्न
What do you mean by polar molecules and non-polar molecules? Give ‘one’ example each.
With the help of a suitable example and an equation, explain the term pair production.
Potassium-40 can decay in three modes. It can decay by β−-emission, B*-emission of electron capture. (a) Write the equations showing the end products. (b) Find the Q-values in each of the three cases. Atomic masses of `""_18^40Ar` , `""_19^40K` and `""_20^40Ca` are 39.9624 u, 39.9640 u and 39.9626 u respectively.
(Use Mass of proton mp = 1.007276 u, Mass of `""_1^1"H"` atom = 1.007825 u, Mass of neutron mn = 1.008665 u, Mass of electron = 0.0005486 u ≈ 511 keV/c2,1 u = 931 MeV/c2.)
Atomic mass unit (u) is defined as ________ of the mass of the carbon (12C) atom.
The nuclei of isotopes of a given element contain the same number of ______.
A vessel contains oil (density 0.8 g/cm3) over mercury (density 13.6 g/cm3). A sphere of homogeneous composition floats with half its volume immersed in mercury and the other half in oil. The density of the material of the sphere in g/cm3 is ______.
A nucleus yYx emits one α and two β particles. The resulting nucleus is ______.
Distinguish between isotopes and isobars.
Which of the following are the constituents of the nucleus?
What conclusion is drawn from Rutherford’s scattering experiment of α-particles?
