Atomic Spectra

Question 1

Atomic gases give which spectrum?

Answer 1

Line spectrum

Question 2

first spectra of atomic hydrogen

Answer 2

in 1885 by JJ Balmer identified first (visible) series of hydrogen atomic spectrum. the balmer series

Question 3

Time the electron stays in excited state?

Answer 3

10^-8 s

Question 4

Spectrum of solid, liquid, dense gas?

Answer 4

Continuous

Question 5

Light from hydrogen gas in discharge tube?

Answer 5

Bluish-red light

Question 6

black body radiation

Answer 6

continuous spectrum

Question 7

molecular spectra

Answer 7

band spectrum

Question 8

Atomic spectra

Answer 8

Line or discrete spectrum

Question 9

spectroscopy?

Answer 9

branch of physics that deals with investigation of wavelenghts and intensties of electromagnetic radiation emitted or absorbed.

Question 10

Rydberg?

Answer 10

J.R Rydberg in 1896
1/lambda = Rh (1/2^2 - 1/n^2)
for balmer

Question 11

Rydberg constant?

Answer 11

1.0974 × 10^7 per meter

Question 12

Possible no. of lines in a spectrum ?

Answer 12

n(n-1)/2

Question 13

spectral series?

Answer 13

a group of radiations emitted by an atom having specific regularity in wavelength is called spectral series.

Question 14

spectral series and their region?

Answer 14

lyman n=1 UV
balmer n=2 visible
paschen n=3 IR
bracket n=4 far IR
pfund n=5 far IR

Question 15

line spectrum of hydrogen wavelength and colors

Answer 15

Red 656 nm
blue green 486 nm
blue 434 nm
violet 410 nm

Question 16

Max and minimum wavelength obtained?

Answer 16

when electron jumps from energy level right above? max wavelength, minimum frequency/energy is obtained.
when electron jumps from infinity ?
minimum wavelength, max frequency./energy is obtained

Question 17

unit of E/hc ?

Answer 17

Rh = E/hc (per meter)

Question 18

E=R.hc

Answer 18

2.178 ×10^-18

Question 19

energies in different shells?

Answer 19

n=1 -13.6
n=2 -3.4
n=3 -1.51
n=4 -0.85
n=5 -0.54
n=6 -o.38
n=7 -0.28
n= infinite 0