Question and Answer Health Contents

Question and Answer
1 | P a g e
Health

Question and Answer
Contents
Solution 1a.......................................................................................................................................3
Solution 1b.......................................................................................................................................3
Solution 2a.......................................................................................................................................3
Solution 2bi......................................................................................................................................4
Solution 2bii.....................................................................................................................................4
Solution 3ai......................................................................................................................................4
Solution 3aii.....................................................................................................................................5
Solution 3b.......................................................................................................................................5
Solution 3c.......................................................................................................................................5
Solution 3d.......................................................................................................................................5
Solution 4a.......................................................................................................................................6
Solution 4b.......................................................................................................................................6
Solution 4c.......................................................................................................................................6
2 | P a g e

Question and Answer
Solution 1a
As given in question,
Half life T1/2=¿2.72*365*24*60*60 = 85777920 seconds, Avogadro’s Number = 6.022 x 1023
Atomic weight = 273 gm,
Decay constant = 0.693/T1/2 = 0.693/ 85777920= 8.079 x 10-9 seconds
As given in question, 90% of material goes to ground state and 10 % excited state.
No of particle in excited state 2
273 x6.022x1023 x0.1 = 4.41172 x 1020 particle,
We know that, From question, No = 4.41172 1020, t = 20 seconds, λ=8.079x10−9
Nt=No e−λt Putting the value
Nt=4.411721020 x2.72(−20∗8.079x 10−9)
` Nt=4.411721020 x2.72(−20∗8.079x 10−9)
Nt=4.41172x 1020
The gamma ray emitted from 2 gm of Isotopes X = 4.411 x 1020 rays
Solution 1b
The main characteristics of scintillation detectors are
It must be solid and robust device, which is easily operated, the biased voltage required
for operation is quite low as compared to gas filled detectors.
The scintillation detectors are moisture proof device. It does not require protection form
moisture.
The energy lost by particle in scintillation detector should be quite low, as compared to
other devices.
There should be fast response time, and able to detect minute energy fluctuation.
Solution 2a
The nucleus which is above the stability belt i.e. A in this case emits β particle, in this case
neutron is higher that proton in n/p ratio. The extra neutron, due to which nucleus is unstable
3 | P a g e