1
WB JEE 2024
MCQ (Single Correct Answer)
+1
-0.25
Change Language

After the emission of a $$\beta$$-particle followed by an $$\alpha$$-particle from $${ }_{83}^{214} \mathrm{Bi}$$, the number of neutrons in the atom is -

A
210
B
128
C
129
D
82
2
WB JEE 2023
MCQ (Single Correct Answer)
+1
-0.25
Change Language

If in case of a radio isotope the value of half-life (T$$_{1/2}$$) and decay constant ($$\lambda$$) are identical in magnitude, then their value should be

A
0.693/2
B
(0.693)$$^{1/2}$$
C
(0.693)$$^2$$
D
0.693
3
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
For the reaction $$_7^{14}N(\alpha ,p)\,{}^{17}O$$, 1.16 MeV (Mass equivalent = 0.00124 amu) of energy is absorbed. Mass on the reactant side is 18.00567 amu and proton mass = 1.00782 amu. The atomic mass of $${}^{17}O$$ will be
A
17.0044 amu
B
16.9991 amu
C
17.0114 amu
D
16.9966 amu
4
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.33
Change Language
The half-life period of $${}_{53}{I^{125}}$$ is 60 days. The radioactivity after 180 days will be
A
25%
B
12.5%
C
33.3%
D
3.0%
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