In the Bohr model of the hydrogen atom, let R, V and E represent the radius of the orbit, the speed of electron and the total energy of the electron respectively.Which of the following quantity is proportional to the quantum number n?
E/V
R/E
VR
Hydrogen atoms are excited from ground state to the principal quantum number 4. Then the number of spectral lines observed will be
3
6
5
2
If the electron in a hydrogen atom jumps from an orbit with level n2 = 3 to an orbit with level n1 = 2, the emitted radiation has a wavelength given by
λ = 6/R
λ = R/6
Which of the following transitions in a hydrogen atom emits of the highest frequency?
n = 1 to n = 2
n = 2 to n = 6
n = 2 to n = 1
n = 6 to n = 2
If 13.6 eV energy is required to ionize the hydrogen atom, then the energy required to remove an electron from n = 2 is
102 eV
Zero
3.4 eV
6.8 eV
To explain theory of hydrogen atom, Bohr considered
Quantisation of linear momentum
Quantisation of angular momentum
Quantisation of angular frequency
Quantisation of energy
When hydrogen atom is in its first excited level, its radius is
Four times, its ground sate radius
Twice, its ground state radius
Same as its ground state radius
Half of its ground state radius
The valence electron in alkali metal is a
ƒ - electron
p -electron
s -electron
d -electron
The spectrum obtained from a sodium vapour lamp is an example of
Band spectrum
Continuous spectrum
Emission spectrum
Absorption spectrum
Which source is associated with a line emission spectrum?
Electric fire
Neon street sign
Red traffic light
Sun
