Atoms

The ratio of the magnitude of the kinetic energy to the potential energy of an electron in the 5th excited state of a hydrogen atom is :

1. 4
2. 1
3. 12
4. 14

An electron of hydrogen atom in an excited state is having energy En=-0.85 eV. The maximum number of allowed transitions to lower energy level is .

An electron revolving in nth Bohr orbit has magnetic moment n. If n nx, the value of x is

1. 2
2. 0
3. 3
4. 1

When a hydrogen atom going from n=2 to n=1 emits a photon, its recoil speed is x5 m/s. Where x= . (Use, mass of hydrogen atom =1.6 10-27 kg)

Given below are two statements: In the light of the above statements, choose the most appropriate from the options given below

1. Both Statement I and Statement II are true
2. Statement I is true but Statement II is false
3. Statement I is false but Statement II is true
4. Both statement I and statement II are false

Hydrogen atom is bombarded with electrons accelerated through a potential difference of V, which causes excitation of hydrogen atoms. If the experiment is being performed at T=0 K, the minimum potential difference needed to observe any Balmer series lines in the emission spectra will be 10 V, where = .

The radius of third stationary orbit of electron for Bohr's atom is R. The radius of fourth stationary orbit will be:

1. 43R
2. 169R
3. 34R
4. 916R

If Rydberg's constant is R, the longest wavelength of radiation in Paschen series will be 7R, where = .