Grade 12th passGeneral Physics
Sir please answer question 17 with proper details please
2 Answers
Arun
Approved Tutor Answer8 Years agoDear Vaishali
As we know
E = hc/
Now
E = e * V = hc/
e = 1.6 * 10^-19
h = 6.626 * 10^-34 J - sec
c = 3 * 10^8 m/sec
Use these value and find V in volts
Regards
Arun (askIITians forum expert)
Ishita Chatterjee
Approved Tutor Answer8 Years agoHello Vaishali,
Well, the electron stops, when it’s velocity is zero. Therefore, 1/2mv2=0. Therefore, 
=o. Therefore, V= 
. Substitute standard values for the given quantities, h=planck’s constant, c= velocity of light, e= charge on electron, 
= de broglie wavelength. You’ll have your answer.
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