What is photoelectric effect? State the result of photoelectric effect experiment that could not be explained on the basis of laws of classical physics. Explain this effect on the basis of quantum theory of electromagnetic radiations.

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Vishal Baghel | Contributor-Level 10

9 months ago

This is a Long Answer Type Questions as classified in NCERT Exemplar

ANS-When the beam of light gets exposed to the metal surface then the electrons get emitted from the metal. This effect is said to be photoelectric effect and the emitted electrons are said to be photoelectrons. The result of photoe

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Find out the number of following orders which are INCORRECT against the mentioned properties:

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(iii) D₂ < He (Boiling point)

(iv) HF > H₂O (Melting point)

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Vishal Baghel

Kindly go through the answers

(7.00)

Consider the following reaction:
(A substituted phenol reacts with H? and CrO?Cl to produce product 'P'.)
The product ‘P’ gives positive acetyl chloride test. This is because of the presence of which of these –OH group(s)?


Raj Pandey

Kindly consider the following Image

The number of radial land angular nodes in 4d orbital are, respectively

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In 4d orbital, n = 4 and $l = 2$

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The spin-only magnetic moment value of species is________× 10^-2 BM. (Nearest integer)

[Given:  $\sqrt[]{3} = 1.73]$

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$B_{2}^{+} \to σ 1 s^{2} s * 1 s^{2} σ 2 s^{2} σ * 2 s^{2} π 2 p^{1}$

Here, number of unpaired electrons, n = 1

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Vishal Baghel

$Δ H = Δ U + Δ (P V)$

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Chemistry NCERT Exemplar Solutions Class 11th Chapter Two 2025

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