Question

Calculate the wavelength, λ, in meters of a photon capable of exciting an electron in He+ from the ground state to n = 4.

Answer 1

first find the energy of electron in He+ for n=4

use the formula

E(n)= -13.6 Z^2/n^2, here Z=2 and n=4

then use the Planck's relation

E= h nu = h c/(lambda)
find lambda..

Answer 2

Use rydberg equation\[1/\lambda=R*Z ^{2}*(1/n _{1}^{2}-1/n _{2}^{2?})\]
Insert the values of R=10.97373E6 and value of Z, n1 and n2 from given data. you'll get it.

Answer 3

E(n)= -13.6 Z^2/n^2 ev

Answer 4

i do all that and yet i cant get the right answer

Answer 5

2.4e-8

Answer 6

what is 2.4e-8 written in numerical form or as a decimal

Answer 7

write it as it is written here