Question

Find energy of each of the photons which (i) correspond to light of frequency 3× 1015Hz. (ii) have wavelength of 0.50 Å
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?
An atom of an element contains 29 electrons and 35 neutrons. Deduce (i)the number of protons and (ii) the electronic configuration of the element (iii) Identify the element
Write down the quantum numbers n and l for the following orbitals a. 2p b. 3d c. 5f
State Heisenberg’s uncertainty principle. Calculate the uncertainty in the position of an electron if the uncertainty in its velocity is 5.7 x 105 m/s.
(i) The energy associated with the first orbit in the hydrogen atom is -2.18 x 10-18J/atom. What is the energy associated with the fifth orbit (ii) Calculate the radius of Bohr’s fifth orbit for hydrogen atom
What are the draw backs of Bohr’s atomic model? Show that the circumference of the Bohr orbit for the hydrogen atom is an integral multiple of the de Broglie wavelength associated with the electron revolving around the orbit.
State photo electric effect. The work function for caesium atom is 1.9 eV. Calculate (a) the threshold wavelength and (b) the threshold frequency of the radiation. If the caesium element is irradiated with a wavelength 500 nm, calculate the kinetic energy and the velocity of the ejected photoelectron
Chlorophyll present in green leaves of plants absorbs light at 4.620 × 1014 Hz. Calculate the wavelength of radiation in nanometer. Which part of the electromagnetic spectrum does it belong to?
Table-tennis ball has a mass 10 g and a speed of 90 m/s. If speed can be​

Answer 1

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