Class 12th

Class 12th Physics Wave Optics

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The time spent in magnetic field (t) is independent of velocity of charge.
t = (1/4) (2πm/qB)

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9 months ago

If the intensity of light in double slit experiment from slit 1 and slit 2 are I₀ and 25I₀ respectively, find the ratio of intensities of light at minima and maxima in the interference pattern.

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Contributor-Level 10

At minima, I = (√I? - √25I? )² = 16I?
At maxima, I = (√I? + √25I? )² = 36I?
∴ Ratio = 16/36 = 4/9

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9 months ago

In Freundlich adsorption isotherm, slope of AB line is:

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Contributor-Level 10

Freundlich adsorption isotherm

$\frac{x}{m} = k p^{1 / n}$

$l o g \frac{x}{m} = \frac{1}{n} l o g p + l o g k$

Comparing with y = mx + C

so, slope of given graph is $\frac{1}{n}$ whose value varies from 0 to 1.

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Which of the following ore is concentrated using group 1 cyanide salt

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Contributor-Level 10

Sphalerite is ore of zinc consists of ZnS during its concentration group 1 cyanides are used as depressants like NaCN

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The major components in “Gun Metal” are:

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Class 12th Electromagnetic Waves

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Major components of gun metal are Cu, Sn and Zn

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9 months ago

A point source surrounded by vacuum emits an electromagnetic wave of frequency of 900 kHz. If the power emitted by the source is 15 W, the amplitude of the electric field of the wave (in 10^-3V/m) at a distance 15 km from the source is :
( (1 / 4πε₀) = 9*10⁹ Nm²/C² and speed of light in vacuum = 3 * 10⁸ ms^-1)

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Contributor-Level 10

I = P/ (4πr²) . (i)
and I = (1/2)ε? E? ²c . (ii)
From (i) and (ii)
P/ (4πr²) = (1/2)ε? E? ²c
E? = √ (2P/ (4πε? r²c) ; E? = √ (9*10? *2*15)/ (15*15*10? *3*10? ) = 2*10? ³ V/m

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'A' and 'B' in the following reactions are:

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Contributor-Level 10

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White precipitate of AgCl dissolves in aqueous ammonia solution due to formation of:

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Raj Pandey

Contributor-Level 9

$A g C l + 2 N H_{3} \to \underset{(S o l u b l e c o m p l e x)}{[A g {(N H_{3})}_{2}] C l}$

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9 months ago

Class 12th Physics

A composite rod made up of two conductors of resistivity ρ₁ and ρ₂ is show in the figure. If face A and B are connected to a battery, find the resistance of the rod.

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Contributor-Level 10

R? = (ρ? L)/a² R? = (ρ? L)/ (3a²)
Both are in parallel . R? = (R? )/ (R? +R? ) = (ρ? ρ? L)/ (a² (3ρ? +ρ? )

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Given below are two statements:

Statement I : Colourless cupric metaborate is reduced to cuprous metaborate in a luminous flame.

Statement II : Cuprous metaborate is obtained by heating boric anhydride and copper sulpahte in a non-luminous flame.

In the light of the above statements, choose the most appropriate answer from the options given below

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