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
Menu
Mayank Mittal Grade: 11
        

Plz explain Threshold frequency and kinetic energy of photoelectrons

8 years ago

Answers : (1)

askIITIians Expert
21 Points
										

Threshold frequency (v0) and kinetic energy of photoelectrons




For each metal, there is a characteristic minimum frequency – the threshold frequency (v0) – below which the photoelectric effect does not occur. Red light (v = 4.3 – 4.6 × 1014 Hz), for example, of any intensity may shine on a piece of potassium for hours but no photoelectrons will be released. But as soon as even a very weak yellow light (v = 5.1 × 5.2 × 1014 Hz) shines on potassium, the photoelectric effect is observed. The threshold frequency, v0 for potassium is 5 × 1014 Hz. For photoelectric effect to occur, the striking photon should have frequency more than that of the threshold frequency. If a photon of frequency (v) strikes a metal atom whose will be emitted only if v > v0. Since the striking photon has energy equal to hv and the minimum energy required to eject electron is hv0 (also called work function, W0) then hv – hv0 is transformed as the kinetic energy of the photoelectron (½ mev2) where me is the mass of electron and v its velocity. Since total energy has to conserved, one may write Einstein’s equation as



hv – hv0 = ½ mev2 = kinetic energy of electron

8 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies
  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: Rs. 15,900
  • View Details
Get extra Rs. 1,272 off
USE CODE: Neerajwin
Get extra Rs. 220 off
USE CODE: Neerajwin

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details