There are 92 protons and 143 neutrons in the nucleus of a radioactive atom. If an α-particle is emitted from that atom how many protons and neutrons will be present in the nucleus of the new atom formed? What type of nuclear reaction is the source of energy of stars? [2 + 1]
After the emission of an α-particle:
The new atom will have 90 protons and 141 neutrons.
The energy of stars is primarily produced by nuclear fusion reactions.
More WBBSE Moderate level questions
Write one use of each of the x-ray and ϒ-ray. Mention one harmful effect of γ-ray.
The correct order of penetrating power of α-, β- and γ- rays is γ > α > β γ > β > α α > β > y β > γ > α
What do you mean by mass defect? Actual mass of proton, neutron and helium nucleus are 1.00728 amu, 1.00867 amu and 4.0015 amu, respectively. What is the mass defect of ⁴₂He (helium) nucleus? [1+2]
Explain nuclear fission. Why is nuclear fission essential for nuclear fusion? [2+1]
The number of a and β particles emitted in the reaction 86A222 → 84B210 wouldrespectively be (a) 6α, 3β (b) 3α, 4β (c) 4α, 3β (d) 3α, 6β
By the emission of which radioactive ray from the atom of a radioactive element, no new atom is created?
Mention one peaceful use of atomic energy. OR Fill up the blank : γ-ray is ____ wave of short wavelength.
Compare the charge, penetrating power and ionising power of α and γ rays.
Mention one practical application of controlled chain reaction. OR Why is a nuclear fission conducted before a nuclear fusion ?
Which of the following rays has the highest capacity to ionise gases? (a) α-ray (b) γ-ray (c) β-ray (d) Light ray
If the mass of an electron is m, then the mass of a β-particle is: (a) m (b) 2m (c) 3m (d) 4m
State the S.I. unit of radioactivity.
