EM WAVES
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1
value of plancks constant
h=6.63×10^-34
2
energy of single photon
hc/lemda
3
value of hc in ev= Armstrong
12400ev
4
no of photons emitted/time
plemda/hc
5
Intensity
power/Area
6
no of photons incident/time (both incident perpendicular and nor perpendicular)
IAlemda/hc
7
photon flux (both perpendicular and not perpendicular)
n/Acostheta and N/a
8
work function
hc/f• (f•= threshold frequency)
9
photoelectric efficiency
ne/np × 100%
10
Which photoelectric Electron has Max KE and how much?
The Electron that moves fastest (which reaches first) and KE=(E-Fi)
11
what is stopping potential?
When polarity of cell is reversed then max potential which can stop fastest moving Electron front reaching the collector plate.
12
What is saturation Current?
At one point during photoelectric effect electrons will all reach collector plate from emitter plate then saturation current is achieved.
13
Value of stopping Potential
Vs= Max KE/ e
14
Value of e
1.6 × 10^-19
15
If a metal changes will the slop of graph of stopping potential and frequency is increased?
Yes, if metal change, fi will change, slope will change
16
value of saturation current
Ne×e
17
If rate of emission of Electron and rate of collection of Electron is equal then what current is it?
Saturation current
18
De broglie wavelength
lemda= H/mv=Hoot(2mKE)= hoot(2mqv)=hoot(3mkt)
19
Why is Biasing voltage used in photodiode?
Used to inc the low current in the circuit, by Inc biasing voltage I Inc and then saturated finally.
20
What did davisson and German Experiment verified?
That a beam of e show wave nature and exhibit interference
21
mass of electron,proton,destroy,alpha-particle, C-12 atom
1,1,2,4,12
22
charge of electron,proton,destroy,alpha-particle, C-12 atom
e,e,e,2e,0
23
Acceleration of electron in magnetic field
F/m
24
Momentum in terms of KE
P=root(2mKE)
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