1
The ratio of radii of first orbits of H, He+ and Li2+ is: ...
Atomic Structure
2
The mass of photon having wavelength 1 nm is: ...
Atomic Structure
3
The energy of second orbit of hydrogen is equal to the energy of: ...
Atomic Structure
4
What is the energy in eV required to excite the electron from n = 1 to ...
Atomic Structure
5
The maximum kinetic energy of photoelectrons ejected from a metal, whe ...
Atomic Structure
6
Which of the following statements is wrong about cathode rays? ...
Atomic Structure
7
A light whose frequency is equal to 6 x 10^14 Hz is incident on a meta ...
Atomic Structure
8
A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 ...
Atomic Structure
9
In a hydrogen atom, the transition takes place from n= 3 to n = 2. If ...
Atomic Structure
10
A body of mass x kg is moving with velocity of 100 m sec^-1. Its de Br ...
Atomic Structure
11
A 200 g cricket ball is thrown with a speed of 3.0 x 10^3 cm sec^-1. W ...
Atomic Structure
12
The wave number of the first line of Balmer series of hydrogen is 1520 ...
Atomic Structure
13
If the ionization energy for hydrogen atom is 13.6 eV, then the ioniza ...
Atomic Structure
14
Velocity of de Broglie wave is given by: ...
Atomic Structure
15
If the kinetic energy of an electron is increased 4 times, the wavelen ...
Atomic Structure
16
A radiation of wavelength λ illuminates a metal and ejects photoelectr ...
Atomic Structure
19
Which is the correct statement about proton? ...
Atomic Structure
20
The radius of the first orbit of H-atom is r. Then the radius of the f ...
Atomic Structure
21
The ionisation energy of the electron in the 1s-orbital of the hydroge ...
Atomic Structure
22
The frequency of radiation emitted when the electron falls from n = 4 ...
Atomic Structure
23
In an atom, an electron is moving with a speed of 600 m/s with an accu ...
Atomic Structure
24
The ratio of slopes of maximum kinetic energy versus frequency and sto ...
Atomic Structure
25
A body of mass x kg is moving with velocity of 100 m sec^-1. Its de Br ...
Atomic Structure
26
What is the total number of orbitals in the shell to which the g-subsh ...
Atomic Structure
27
If the speed of electron in first Bohr orbit of hydrogen be 'x', then ...
Atomic Structure
28
The number of spectral lines that are possible when electrons in 7th s ...
Atomic Structure
29
An electron in an atom undergoes transition in such a way that its kin ...
Atomic Structure
30
The de Broglie wavelength of 1 mg grain of sand blown by a 20 ms^-1 wi ...
Atomic Structure
31
The ratio of elm for a cathode ray: ...
Atomic Structure
