Question

The kinetic energy of an electron ionized from hydrogen atom is twice the energy liberated during the transition of electron from 5th energy level to 2nd excited state in He+ ion. Then the wavelength required for such transition is________
,provided the threshold frequency is 3.29 x 1015 sec
(a) 12.36 nm
(b) 14.89 nm
(c) 15.16 nm
(d) 18.43 nm​

Answer 1

Answer:

when an unknown wavelength of light was shined on a metallic surface, the electron is ejected with a velocity of

1.0 \times 10 {}^6ms {}^ - 11.0×106ms−1

If the threshold energy (work function) of the electron is

2.8575 \times 10 {}^ - 18 \: joules2.8575×10−18joules

the wavelength of light in nm is :