Answer:
Explanation:
Complete Question:
A.Compute no of electrons you expect to count if silicon detector is struck with a 1.04 Mev gamma ray produced in a decay of 136 Cs nucleus.
b.Explain counting of electrons is more precise as the detector is cooled well below room temperature
Answer:
a.
Gamma ray energy =![Cs^{135}=1.04 Mev](https://tex.z-dn.net/?f=Cs%5E%7B135%7D%3D1.04%20Mev)
photon strikes the surface excite the electrons to move from valence band to conduction band where then counted by detector.
energy gap between valence band and conduction band in case of silicon = 1.1 eV
The minimum amount of energy required is 1.1 ev
minimum number of electron counted is = ![\frac{1.04 Mev}{1.1eV/electrom}](https://tex.z-dn.net/?f=%5Cfrac%7B1.04%20Mev%7D%7B1.1eV%2Felectrom%7D)
=![0.945\times10^{6}](https://tex.z-dn.net/?f=0.945%5Ctimes10%5E%7B6%7D)
b.
In the case of semi conductors
forbidden energy gap in inversely proportional to temperature
with decrease in temperature forbidden energy gap increases,hence electrons jumping from valence band to conduction band decreases and hence counting by detector decreases
Answer:
From -15⁰ to 0⁰
H=mc¶
where H= heat absorbed or evolved
m=mass involved
c=specific heat capacity
¶=change in temperature
H=mc¶
Answer:
The first law, an object will not change its motion unless a force acts on it. In the second law, the force on an object is equal to its mass times its acceleration. In the third law, when two objects interact
....
Explanation:
Answer:
1.2
Explanation:
Index of refraction = actual thickness/virtual thickness
Actual thickness = 3cm, virtual thickness = 2.5cm
Index of refraction = 3/2.5 = 1.2
First of all, if it's filled with hot air, then there's no deflated balloon.
If a weight of 8,000N is raised to an altitude of 1,000 meters,
then 8 million Joules of work has been done.
Gravity does the work. The hot air doesn't.
If you filled the same balloon with the same hot air on the Moon,
the balloon would just lay there on its side on the lunar regolith
and look ridiculous, like some kind of enormous cloth light bulb.
The same hot air couldn't budge it an inch.