HARD
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The ratio of the frequency corresponding to the third line in the Lyman series of hydrogen atomic spectrum to that of the first line in Balmer series of Li2+ spectrum is

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Important Questions on Structure of Atom

MEDIUM
Establish Einstein's relation 12mu2=hv-hv0 with respect to photoelectric emission.
EASY
If the work function for the photoelectron emission of a metal is 3.75eV, then the threshold wave length of the radiation needed for the ejection of the electron is approximately
EASY
Find the energy in eV of an X-ray photon of wavelength λ=1Ao.
EASY
Charge on an electron is 1.6×10z coulomb. The value of z is _____.
MEDIUM
In a photoelectric effect experiment, a point source of light of power 3.2 mW emits photons each of which has 5 eV energy. The source is located at a distance of 0.8 m from the centre of a stationary metal disk having a work function of 3 eV. The metal disk has a radius of 8×10-3 m. Assuming that one photoelectron is emitted for every 106 photons striking the surface of the disk, how many photoelectrons are emitted every second?
HARD
Why is wave theory of electromagnetic radiation is not able to explain photo electric effect? How does photon picture resolve this problem?
MEDIUM
When photon of energy 4.0 eV strikes the surface of a metal A, the elected photoelectrons have maximum kinetic energy TA eV and de-Broglie wavelength λA. The maximum kinetic energy of photoelectron liberated from another metal B by photon of energy 4.50 eV is TB=TA-1.50 eV. If the de-Broglie wavelength of these photoelectrons λB=2λA, then choose the correct statement(s).
MEDIUM
Light of frequency 8.41×1014Hz is incident on a metal surface. Electrons with a maximum speed of 7.5×105 ms-1 are ejected from the surface. Calculate the threshold frequency for photo emission of electrons. Also find the work function of the metal in electron volt (eV). Given, Planck's constant h=6.625×10-34 Js-1and mass of the electron m=9.1×10-31Kg.
MEDIUM
The typical electric field required for electrons to be emitted from surfaces of metals by the "field emission" process is about
MEDIUM
Photoelectrons are emitted from a given metal surface when it is illuminated by two beams P and Q of light, both having the same frequency. The saturation value of the photocurrent produced by P has a magnitude which is four times that produced by Q. The ratio of the electric field strength in beam P to that in Q is
EASY
A laser produces monochromatic light of wavelength 530.4 nm. The power emitted is 3.0 mW. The number of photons emitted per second on an average is h=6.63×10-34 Js, c=3×108ms-1
EASY
In the line spectra of hydrogen atom, difference between the largest and the shortest wavelengths of the Lyman series is 305 A. The corresponding difference for the Paschan series in A is:________. (nearest integer)