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