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Yogita Ingle 6 years, 3 months ago
Le Chatelier’s principles, also known as the equilibrium law, are used to predict the effect of some changes on a system in chemical equilibrium (such as the change in temperature or pressure). The principle is named after the French chemist Henry Louis Le Chatelier.
Le Chatelier said that equilibrium adjusts the forward and backward reactions in such a way to accept the changes affecting the equilibrium conditions.
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Yogita Ingle 6 years, 3 months ago
Zidovudine (INN) or azidothymidine (AZT)) (also called ZDV) is a nucleoside analog reverse-transcriptase inhibitor (NRTI), a type of antiretroviral drug used for the successful treatment of HIV/AIDS infectiousness. It is a therapeutic analog of thymidine
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Yogita Ingle 6 years, 3 months ago
“The phenomenon of ejection of electrons from the surface of a metal when light of suitable frequency strikes on it, is called photoelectric effect.
The emitted electrons are called photoelectrons.”
Experimental studies of photoelectric effect under different conditions led to the following important observations—
(i) The electrons are ejected from the metal surface as soon as the beam of light strikes the surface. .
(ii) For each metal, certain minimum frequency of
light is needed to eject the electrons. This is known as threshold frequency and it is different for different metals.
(iii) The kinetic energy of the ejected electrons is
directly proportional to the frequency of the incident radiation and it is independent of its intensity.
(iv) The number of electrons ejected per second from the metal surface depends upon the intensity or brightness of incident radiation but does not depend upon its frequency
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Yogita Ingle 6 years, 3 months ago
Planck’s quantum theory:
According to this theory:
- Energy emitted or absorbed is not continuous, but is in the form of packets called quanta .In terms of light it is called as photon.
- Each photon carries an energy which is directly proportional to the frequency of wavelength i.e. E depends upon v (nu).
- Or E=hv (where v is frequency)
- Value of h =6.634 x 10-34Jsec
- Energy associated with no of packets is given by:
E=nhv (where n is an integral multiple)
This formula can also be written as:
E = (nhc)/ (λ)
(Because we know frequency=speed of light/wavelength)
V = (c/ λ)
Sia ? 6 years, 3 months ago
According to Planck's quantum theory, Different atoms and molecules can emit or absorb energy in discrete quantities only. The smallest amount of energy that can be emitted or absorbed in the form of electromagnetic radiation is known as quantum.
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Arti Singh 6 years, 3 months ago
2Thank You