A 12:5 eV electron beam is used to
bombard gaseous hydrogen at room temperature. Upto
which energy level the hydrogen atoms would be
excited ?
Calculate the wavelengths of the first member of
Lyman and first member of Balmer series
Answers
Answered by
1
12.5 ev energy used
let upto n it excites
13.6( 1 -1/n^2) = 12.5
(1-1/n^2) = 12.5/13.6 =0.9
1/n^2 = 0.1
n^2 = 10
n less than 4 So it excites upto 3
first member of lyman
1 to 2
1/wavelength = R ( 1- 1/4)
= 1.09 × 10^7 × 3/4
= 0.8175× 10^7
wavelength = 1/0.8175×10^7. = 1.223 × 10^-7
balmer 2 to 3
(1/4 -1/9) = 5/36
above lyman contains 4/3 factor
so multiply by 9 ×3/5 = 27/5
27/5. × 1.223× 10^-7 = 5.4 ×1.223× 10^-7 = 6.604 × 10^-7
Anonymous:
have u got it
Similar questions
Computer Science,
8 months ago
Physics,
1 year ago
Math,
1 year ago
Chemistry,
1 year ago
Computer Science,
1 year ago