#### Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Click to Chat

1800-1023-196

+91-120-4616500

CART 0

• 0
MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping

# stopping potential and kinetic energy of electron

Aman Bansal
592 Points
8 years ago

Dear Najid,

KE(max)=hf - work function
KE(max)=e(delta Vs)
delta Vs=stopping potential
delta Vs= (hf)/e - (work function)/e
which is same thing as
delta Vs=(hc)/(e*wavelength) - (work function)/e

*you need to find the value of work function to find the new stopping potential.
Stopping potential=2.10 v
Stopping potential= hc/e*wavelength - work function/e
Stopping potential= (6.63e-34 J*sec)(3.00e8m/s)/(290e-9m)(1.60e-19) - work function
work function= 2.186637931 V

using this, you get
New Stopping potential= 0.6386461599 Volt
--------------------------------------…
The stopping potential is the potential (energy/unit charge) or (Joules/Coulomb) that must be applied to stop the electrons from being ejected from the surface when the light is shone on it. If the energy of the incident photon is greater than the work required to remove the electron from the surface plus the applie (-) potential, electrons will leave the surface with some kinetic energy. The stopping potential is the applied potential that makes this KE=0

qV(s)=E(photon)-q(work function)
V(s)=hv/q - work function

V(s)=stopping potential
and hv/q is same thing as hc/q(lambda)

Cracking IIT just got more exciting,It s not just all about getting assistance from IITians, alongside Target Achievement and Rewards play an important role. ASKIITIANS has it all for you, wherein you get assistance only from IITians for your preparation and win by answering queries in the discussion forums.

So start the brain storming…. become a leader with Elite Expert League ASKIITIANS

Thanks

Aman Bansal