The half life of radium is about 1600 year. Of 100 gram of radium existing now
The half life of radium is about 1600 year. Of 100 gram of radium existing now, 25g will remain unchanged…
7 years ago
Radioactivity
In the reaction ₉₂U²³⁴→₈₇Y²²², how many α-particle and β-particles are emitted
In the reaction ₉₂U²³⁴→₈₇Y²²², how many α-particle and β-particles are emitted respectively? Options (a) 3,5 (b) 5,3 (c) 3,3 (d)…
7 years ago
which of the following can not be emitted by radioactive substances during their decay?
which of the following can not be emitted by radioactive substances during their decay? Options (a) Electrons (b) Protons (c)…
7 years ago
A nucleus with mass number 220 initially at rest emits an α-particle. If the Q-value
A nucleus with mass number 220 initially at rest emits an α-particle. If the Q-value of the reaction is 5.5…
7 years ago
A nucleus of mass number 220, initially at rest, emits an α-particle. If the Q-value
A nucleus of mass number 220, initially at rest, emits an α-particle. If the Q-value of the reaction is 5.5…
7 years ago
Which of the following atoms has the lowest ionisation potential?
Which of the following atoms has the lowest ionisation potential? Options (a) ₈O¹⁶ (b) ₇N¹⁴ (c) ₅₅Cs¹³³ (d) ₁₈Ar⁴⁰ Correct…
7 years ago
In which of the following systems will the radius of the first orbit (n=1) be minimum?
In which of the following systems will the radius of the first orbit (n=1) be minimum? Options (a) Single ionised…
7 years ago
If t₁ ̷ ₂ is the half-life of a substance, then t₃ ̷ ₄ is the time in which
If t₁ ̷ ₂ is the half-life of a substance, then t₃ ̷ ₄ is the time in which Options…
7 years ago
If the half-life of a material is 10 yr, then in what time, it becomes 1/4th part
If the half-life of a material is 10 yr, then in what time, it becomes 1/4th part of the initial…
7 years ago
A radiactive substance emits 100 beta particles in the first 2s and 50 beta
A radiactive substance emits 100 beta particles in the first 2s and 50 beta particles in the next 2s. The…
7 years ago