1
The ratio of radii of first orbits of H, He+ and Li2+ is: ...
2
The mass of photon having wavelength 1 nm is: ...
3
The energy of second orbit of hydrogen is equal to the energy of: ...
4
What is the energy in eV required to excite the electron from n = 1 to n = 2 state in hydrogen atom? ...
5
The maximum kinetic energy of photoelectrons ejected from a metal, when it is irradiated with radiat ...
6
Which of the following statements is wrong about cathode rays? ...
7
A light whose frequency is equal to 6 x 10^14 Hz is incident on a metal whose work function is 2eV ( ...
8
A 600 W mercury lamp emits monochromatic radiation of wavelength 331.3 nm. How many photons are emit ...
9
In a hydrogen atom, the transition takes place from n= 3 to n = 2. If Rydberg constant is 1.097 x 10 ...
10
A body of mass x kg is moving with velocity of 100 m sec^-1. Its de Broglie wavelength is 6.62 x 10^ ...
11
A 200 g cricket ball is thrown with a speed of 3.0 x 10^3 cm sec^-1. What will be its de Broglie's w ...
12
The wave number of the first line of Balmer series of hydrogen is 15200 cm^-1. The wave number of th ...
13
If the ionization energy for hydrogen atom is 13.6 eV, then the ionization energy for He+ ion should ...
14
Velocity of de Broglie wave is given by: ...
15
If the kinetic energy of an electron is increased 4 times, the wavelength of the de Broglie wave ass ...
16
A radiation of wavelength λ illuminates a metal and ejects photoelectrons of maximum kinetic energy ...
19
Which is the correct statement about proton? ...
20
The radius of the first orbit of H-atom is r. Then the radius of the first orbit of Li2+ will be: [A ...
21
The ionisation energy of the electron in the 1s-orbital of the hydrogen atom is 13.6 eV. The energy ...
22
The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom wi ...
23
In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainty with ...
24
The ratio of slopes of maximum kinetic energy versus frequency and stopping potential (Vo) versus fr ...
25
A body of mass x kg is moving with velocity of 100 m sec^-1. Its de Broglie wavelength is 6.62 x 10^ ...
26
What is the total number of orbitals in the shell to which the g-subshell first arise? ...
27
If the speed of electron in first Bohr orbit of hydrogen be 'x', then speed of the electron in secon ...
28
The number of spectral lines that are possible when electrons in 7th shell in different hydrogen ato ...
29
An electron in an atom undergoes transition in such a way that its kinetic energy changes from x to ...
30
The de Broglie wavelength of 1 mg grain of sand blown by a 20 ms^-1 wind is: ...
31
The ratio of elm for a cathode ray: ...
