|
Which shell would be the first to have a g-subshell?
|
|
0
|
4196
|
August 10, 2016
|
|
How much energy is required for the removal of only electron present in the hydrogen atom?
|
|
0
|
2145
|
August 10, 2016
|
|
The threshold wavelength for a metal surface is ${{\lambda }_{0}}$. HOW is it related to the work function of the metal?
|
|
0
|
525
|
August 10, 2016
|
|
What type of spectrum is obtained when light emitted from discharge tube containing hydrogen gas is analysed?
|
|
0
|
896
|
August 10, 2016
|
|
Which of the following has smallest derogliewavelength ? ${{O}_{\upsilon }}$ ${{H}_{2}}$ a proton or an electron
|
|
0
|
489
|
August 10, 2016
|
|
What is photoelectric effect? explain briefly:
|
|
0
|
35700
|
August 10, 2016
|
|
A photon of wavelength 4 x ${{10}^{-7}}$ m strikes on metal surface, the work function of the metal being 2.13 eV. Calculate
|
|
1
|
2649
|
August 10, 2016
|
|
Neon gas is generally used in the sign boards
|
|
1
|
3416
|
August 10, 2016
|
|
What are the properties of electromagnetic waves? Explain briefly
|
|
0
|
2739
|
August 10, 2016
|
|
The ejection of the photoelectron from the silver metal in the photoelectric effect experiment can be stopped by applying the voltage of 0.35 V when the radiation 256.7 nm is used
|
|
1
|
3050
|
August 10, 2016
|
|
What is the energy in joules, required to shift the electron of the hydrogen atom from the first Bohr orbit to the fifth Bohr orbit and what is the wavelength of the light emitted when the electron returns to the ground state?
|
|
0
|
4046
|
August 10, 2016
|
|
Electrons are emitted with zero velocity from metal surface when it is exposed to radiation of wave¬length 6800 A. Calculate threshold frequency (v0) and work function (W0) of the metal
|
|
0
|
4674
|
August 10, 2016
|
|
Emission transitions in the Paschen series end at orbit n = 3 and start from orbit n and can be represnted as u = 3.29 x 1015 (Hz) [1/32 - 1Jtt2] Calculate die value of n if transition is observed at 1285 nm. find the region of the spectrum
|
|
0
|
3525
|
August 10, 2016
|
|
A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calcuate the number of photons emitted per second by the bulb
|
|
0
|
11109
|
August 10, 2016
|
|
Lifetimes of the molecules in the excited states are often measured by using pulsed radiation source of duration nearly in the nano second range. If the radiation source has the duration of 2 ns and the number of photons emitted during the pulse source is
|
|
0
|
786
|
August 10, 2016
|
|
The velocity associated with a proton moving in a potential difference of 1000 V is 4.37 x 105 ms-1. If the hockey ball of mass 0.1 kg is moving with this velocity, calculate the wavelength associated with this velocity
|
|
0
|
3191
|
August 10, 2016
|
|
What are the main achievements of Bohr's theory of atom?
|
|
0
|
8090
|
August 10, 2016
|
|
What is the wavelength of light emitted when the electron in a hydrogen atom undergoes transition from an energy level with n = 4 to an energy level with n = 2?
|
|
0
|
12534
|
August 10, 2016
|
|
Electromagnetic radiation of wavelength 242 nm is just sufficient to ionise the sodium atom. Calculate the ionisation energy of sodium in kj mol-1
|
|
0
|
5539
|
August 10, 2016
|
|
What is the number of photons of light with a wavelength of 4000 pm that provide 1J of energy?
|
|
0
|
4556
|
August 10, 2016
|
|
Find energy of each of the photons which
|
|
1
|
2963
|
August 10, 2016
|
|
In astronomical observations, signals observed from the distant stars are generally weak
|
|
1
|
1397
|
August 10, 2016
|
|
What is the energy in joules required to shift the electron of the hydrogen atom from the first Bohr orbit to the fifth Bohr orbit
|
|
1
|
2140
|
August 10, 2016
|
|
Why cannot the motion of an electron around the nucleus be determined accurately?
|
|
0
|
1851
|
August 10, 2016
|
|
Why Bohr's orbits are called energy levels?
|
|
0
|
2429
|
August 10, 2016
|
|
When electrons from various energy levels fall to first energy level in hydrogen, name the series of spectral lines
|
|
0
|
1790
|
August 10, 2016
|
|
Which series of hydrogen spectrum lies in. (i) visible reigon and (ii) UV region
|
|
0
|
6123
|
August 10, 2016
|
|
What is the value of Bohr's radius for the first orbit of hydrogen?
|
|
0
|
538
|
August 10, 2016
|
|
According to Bohr's Model, En of each stationary state is given by the expression :
|
|
1
|
1194
|
August 10, 2016
|
|
Which series of lines of the hydrogen spectrum lies in the visible region?
|
|
0
|
2698
|
August 10, 2016
|