Home
Class 12
PHYSICS
In a mixture of H- He^(+) gas (He+ is si...

In a mixture of `H- He^(+)` gas (`He+ `is singly ionized He atom), `H` atom and `He+` ions are excited to their respective first excited state. Subsequently `H` atoms transfer their total excitation energy to `He+` ions (by collisions) Assume that the bohr model of atom is exactly valid.
The wavelength of light emitted in the visible region by `He+` lons after collisions with `H` atoms is -

A

`6.5 xx 10^(-7)m`

B

`5.6 xx 10^(-7)m`

C

`4.8 xx 10^(-7)m`

D

`4.0 xx 10^(-7)m`

Text Solution

Verified by Experts

The correct Answer is:
C
For visible region `DeltaE lt 10.2 eV` and in this case
`DeltaE=-3.4 -(-6)=2.6 eV`
`lambda=(hc)/(DeltaE)=(12400 eV-Å)/(2.6 eV) cong 4800Å cong 4.8xx10^(-7) m`
Promotional Banner

Topper's Solved these Questions

  • SIMPLE HARMONIC MOTION

    ALLEN|Exercise Comprehension #2|3 Videos

  • SIMPLE HARMONIC MOTION

    ALLEN|Exercise Comprehension #3|3 Videos

  • SIMPLE HARMONIC MOTION

    ALLEN|Exercise MCQ s|8 Videos

  • RACE

    ALLEN|Exercise Basic Maths (Wave Motion & Dopplers Effect) (Stationary waves & doppler effect, beats)|25 Videos

  • TEST PAPER

    ALLEN|Exercise PHYSICS|4 Videos

Similar Questions

Explore conceptually related problems

In a mixture of H- He^(+) gas ( He+ is singly ionized He atom), H atom and He+ ions are excited to their respective first sxcited state subequendy H atoms transfer their total excilation energy to He+ ions (by collsions) Assume that the bohr model of atom is exactly veld. The wavelength of light emitted in the visible region by He+ lons after collisions with H atoms is -

In a mixture of H- He^(+) gas ( He+ is singly ionized He atom), H atom and He+ ions are excited to their respective first sxcited state subequendy H atoms transfer their total excilation energy to He+ ions (by collsions) Assume that the bohr model of atom is exactly veld. The questum number n of the state fnally populand in He^(+) inos is -

In a mixture of H-He^(+) gas ( He^(+) is singly ionized He atom), H atoms and He^(+) ions are excited to their respective first excited states. Subsequently, H atoms transfer their total excitation energy to He^(+) ions (by collisions). Assume that the Bohr model of atom is exctly valid. The ratio of the kinetic energy of the n=2 electron for the H atom to that of He^(+) ion is:

In a mixture of H- He^(+) gas ( He+ is singly ionized He atom), H atom and He+ ions are excited to their respective first sxcited state subequendy H atoms transfer their total excilation energy to He+ ions (by collsions) Assume that the bohr model of atom is exactly veld. The ratio of the kinetic energy of the n = 2 electron for the H atom to the of He^(+) lon is -

In a mixture of He^(Theta) gas H atom and He^(Theta) ions Are excited to three respective first excited subsepuenly , H atom transfers its total excitation energy to He^(Theta) ions by collision .Assuming that Bohr model of an atom is applicable , answer the following question The wavelength of the light amitted in the visible region by He^(Theta) ions qaafter collisions with He^(Theta) ion is

In a mixture of He^(o+) gas H atom and He^(o+) ions Are excited to three respective first excited subsepuenly , H atom transfers its total excitation energy to He^(o+) ions by collision .Assuming that Bohr model of an atom is applicable , answer the following question When an electron of H jumps from a higher to lower energy state ,there

In a mixture of He^(o+) gas H atom and He^(o+) ions Are excited to three respective first excited subsepuenly , H atom transfers its total excitation energy to He^(o+) ions by collision .Assuming that Bohr model of an atom is applicable , answer the following question The ratio of teh potential energy of the n = 2 electron for H atom to the of He^(o+) ion is

In a mixture of He^(Theta) gas H atom and He^(Theta) ions Are excited to three respective first excited subsepuenly , H atom transfers its total excitation energy to He^(Theta) ions by collision .Assuming that Bohr model of an atom is applicable , answer the following question The quantum number n of the statement finaly populated is He^(Theta) ion is .

In a mixture of He^(o+) gas H atom and He^(o+) ions Are excited to three respective first excited subsepuenly , H atom transfers its total excitation energy to He^(o+) ions by collision .Assuming that Bohr model of an atom is applicable , answer the following question If each hydrogen atom in the ground state of 1.0 mol of H atom is excited by absorbing photon of energy 8.4 eV, 12.09 eV and 15.0 eV of energy then the number of spectral lines emitted is equal to