Related InterviewSolutions

• As the mass number A increases, which of the following quantities related to a nucleus do not change?(a) mass (b) volume (c) density (d) binding energy.
• A freshly prepared radioactive source of half-life 2h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is (a) 6h (b) 12h (c) 24h (d) 128h.
• During a negative beta decay, (a) an atomic electron is ejected (b) an electron which is already present within the nucleus is ejected (c) a neutron in the nucleus decays emitting an electron(d) a proton in the nucleus decays emitting an electron.
• The decay constant of a radioactive sample is X. The half-life and the average-life of the sample are respectively(a) 1/λ and (In 2/λ) (b) (In 2/λ) and 1/λ(c) λ(ln 2) and 1/λ (d) λ/(ln 2) and 1/λ.
• In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following particles is emitted in the decay? (a) proton (b) neutron (c) electron (d) photon.
• The masses of 11C and 11B are respectively 11.0114 u and 11.0093 u. Find the maximum energy a positron can have in the β+-decay of 11C to 11B.
• How much energy is released in the following reaction?7Li+p→α+αAtomic mass of 7Li - 7.0160 u and that of 4He - 4.0026 u.
• As the mass number A increases, the binding energy per nucleon in a nucleus(a) increases (b) decreases (c) remains the same (d) varies in a way that depends on the actual value of A.
• Find the binding energy per nucleon of (197,79)Au if its atomic mass is 196.96 u.
• Two lithium nuclei in a lithium vapour at room temperature do not combine to form a carbon nucleus because(a) a lithium nucleus is more tightly bound than a carbon nucleus(b) carbon nucleus is an unstable particle(c) it is not energetically favourable(d) Coulomb repulsion does not allow the nuclei to come very close.