Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: R

There are no items in this cart.
Continue Shopping
Get instant 20% OFF on Online Material.
coupon code: MOB20 | View Course list

Get extra R 650 off


Q.1.A beam of electrons accelerated with 4.64 V was passed through a tube having mercury vapours .As a result of absorption,electronic changes occured with mercury atoms and light was emitted.If the full energy of the single electron ws converted into light ,what was the wave number of emitted light.
Q.2.The binding energy of an electron in the ground state of an atom is equal to 24.6eV.Find the enegry required to remove both electrons from the atom.

7 years ago


Answers : (2)


Hi Vinay,

1) 4.64 eV is the energy of the electron

    if its total energy is converted photons then



2)B.E is 24.6 eV

   for hydrogen it is 13.6 eV

   24.6 which is nearly twice that of hydrogen implies the atom is He

   for first electron it is 24.6 eV

   for second electron it is 27.2 eV

   for removing both the electrons it is 27.2+24.6=51.8 eV


7 years ago


V= 4.64V


  = (1.6 x 10-19 x 4.64) J

  = 7.424 x 10-19 J

E=  hc /λ

  = hcv ,           [where v= 1/λ, v=wave number]

=> v= E/hc

=> v= (7.424 x 10-19) / (6.62 x 10-34 x 3 x 108) m-1

=> v= 37400 cm-1

7 years ago

Post Your Answer

Other Related Questions on Physical Chemistry

why nature favours crystalline solids ? what is meant by anisotropic and isotropic character of solids ?
Because it forms the crystal lattice which can extends in all directions. Isotrophics are those which has all the properties same in all the respective directions Anistropics are those...
Vikas TU 27 days ago
The n factor for potassium ferro cyanide in acidic medium
You no longer have to wait desperately for someone to help resolve your doubt. You can chat with IITians live, 24/7 (even at 3AM!) and get your doubt resolved instantly. Try the HashLearn...
Ankit 3 months ago
n factor is the no of electron transfer for single atom or the oxidation state of central atom . in the complex K4{FE(CN)6} 4(1) +X +6(-1) =0 X-2 =0 SO, X= +2 SO, HERE its n factor is +2 in ...
Umakant biswal 3 months ago
The molar volumes of ice and water are 0.0196 and 0.0190 litres per mole at 273K. If ΔHefor the transition of ice to water is 1440 calories per mole at 1 atm pressure, find ΔU.
Since heat is absorbed here at constant pressure so ΔH = 1440 calories ΔU can be calculated by using the formula : ΔU=ΔH-PΔV P= 1atm, ΔV = 0.0196L - 0.180L = 0.0016 L PΔV = 1*0.0016=...
navneet one month ago
Can`t understand how to name compounds in IUPAC and common names, and how are they attached to compounds??
@ pallavi KIndly be specific , as there are so much groups in alkanes which can be attached , else u can just post a pic of organic compound and i can give u the full explanation on how...
Umakant biswal one month ago
Why does Wurtz reaction wont work with odd number of carbon atoms? Please elaborate. Thanks.
It is not that wutz reaction does not work with odd number it works but a lot of products are formed and you cannot separate the products thus you dont get the desired product
Biswajit dash 23 days ago
Is vicinal dihalide more stable than normal than other halides and dihalide?
Yes, i think so as single carbon atom attache with more than one halide is a advantage. it leads as a strong base and could lead to an elimination reaction easily.
Vikas TU one month ago
View all Questions »

  • Complete JEE Main/Advanced Course and Test Series
  • OFFERED PRICE: R 15,000
  • View Details
Get extra R 3,750 off

Get extra R 650 off

More Questions On Physical Chemistry

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!!
Click Here for details