HARD
JEE Main/Advance
IMPORTANT
Earn 100

Sr90 decays to Y90 by β decay with a half-life of 28 years. Y90 decays by β decay to Zr90 with a half-life of 64 h. A pure sample of Sr90 is allowed to decay. What is the value of NSrNY after a 1 h b 10 years?

Important Questions on Nuclear Physics

HARD
JEE Main/Advance
IMPORTANT
The element Curium Cm96248 has a mean life of 1013seconds. Its primary decay modes are spontaneous fission and α-decay, the former with a probability of 8% and the latter with a probability of 92%. Each fission releases 200MeV of energy. The masses involved in α-decay are as follows :
atomic masses of atoms are Cm96248=248.072220u, He24=4.002603u & Pu94244=244.064100u (1u=931MeV/c2). Calculate the power output from a sample of 1020 Cm atoms.
MEDIUM
JEE Main/Advance
IMPORTANT
Nucleus A73 has binding energy per nucleon of 10 MeV. It absorbs a proton and its mass increases by 99100 times the mass of proton. Find the new binding energy of the nucleus so formed [Take energy equivalent of proton = 930 MeV]
MEDIUM
JEE Main/Advance
IMPORTANT
The nucleus of Th90230 is unstable against α-decay with a half-life of 7.6 × 103 years. Write down the equation of the decay and estimate the kinetic energy of the emitted α-particle from the following data.
mTh90230 =230.0381 amumRa88226 = 226.0254 amu and mHe24 = 4.0026 amu.