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Physics Class 11th

A uniform chain of 6m length is placed on a table such that a part of its length is hanging over the edge of the table. The system is at rest. The co-efficient of static friction between the chain and the surface of the table is 0.5, the maximum length of the chain hanging from the table is………….m.

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Raj Pandey

Contributor-Level 9

F.B.D. of hanging length

F.B.D. of chain lying on the table

f = T = $μ N$

$\Rightarrow λ x g = μ λ (L - x) g$

$x = 0.5 (6 - x)$

$\Rightarrow x = 3 - 0.5 x$

$1.5 x = 3$

x = 2m

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2 months ago

Physics Class 12th

A cell E₁ of emf 6V and internal resistance $2 Ω$ is connected with another cell E₂ of emf 4V and internal resistance $8 Ω$ (as shown in the figure). The potential difference across points X and Y is:

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alok kumar singh

Contributor-Level 10

$i = \frac{6 - 4}{2 + 8} = 0.2 A$

$V_{x} + 4 + 0.2 * 8 = V_{Y}$

$\Rightarrow V_{Y} - V_{X} = 5.6 V$

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2 months ago

Physics Class 12th

A teacher in his physics laboratory allotted an experiment ot determine the resistance (G) of a galvanometer. Students took the observations for $\frac{1}{3}$ $\frac{}{}$ deflection in the galvanometer. Which of the below is true for measuring value of G?

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Raj Pandey

Contributor-Level 9

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New answer posted

2 months ago

Physics Dual Nature of Radiation and Matter

Given below are two statements:

Statements I : Two photons having equal linear momenta having equal waelengths

Statements II : If the wavelength of photon is decreases, then the momentum and energy of a photon will also decrease.

In the light of the above statements, choose the correct answer from the options given below.

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alok kumar singh

Contributor-Level 10

$p = \frac{h}{λ}$

So, two photons having equal linear momenta have equal wavelength. As wavelength decreases, momentum and energy of photon increases.

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2 months ago

Physics Class 11th

Consider two satellites S₁ and S₂ with periods of revolution 1hr. and 8 hr. respectively revolving around a planet in circular orbits. The ratio of angular velocity of satellite S₁ to the angular velocity of satellites S₂ is:

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alok kumar singh

Contributor-Level 10

$ω = \frac{2 π}{T} \Rightarrow \frac{ω_{1}}{ω_{2}} = \frac{T_{2}}{T_{1}} = 8$

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2 months ago

Physics Physics Ray Optics and Optical Instruments

The difference of speed of light in the two media A and B $(υ_{A} - υ_{B})$ $_{}_{}$ is 2.6 * 107 m/s. If the refractive index of medium B is 1.47, then the ratio of refractive index of medium B to medium A is : (Given : speed of light in vacuum c = 3 * 108 ms-1)

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Raj Pandey

Contributor-Level 9

$μ_{B} = \frac{C}{v_{B}}$

$v_{B} = \frac{3 * 1 0^{8}}{1.47} = 20.408 * 1 0^{7}$

$v_{A} = 2.6 * 1 0^{7} + 20.408 * 1 0^{7} = 23 * 1 0^{7}$

$μ_{B} = \frac{C}{v_{B}} & μ_{A} = \frac{C}{v_{A}}$

= 1.127

$\approx 1.13$

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Physics Physics Ncert Solutions Class 12th

A signal of 100 THz frequency can be transmitted with maximum efficiency by:

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Raj Pandey

Contributor-Level 9

Optical fibre frequency range is 1 THz to 1000 THz.

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2 months ago

Physics Physics Semiconductor Devices

The photodiode is used to detect the optical signals. These diodes are preferably operated in reverse biased mode because:

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Raj Pandey

Contributor-Level 9

Very small change in minority charge carriers produces high value of reverse bias current.

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2 months ago

Physics Physics Atoms

The ratio for the speed of the electron in the 3rd orbit of He+ to the speed of the electron in the 3rd orbit of hydrogen atom will be:

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Raj Pandey

Contributor-Level 9

$v \propto \frac{z}{n}$

$v = k \frac{z}{n}$ [K ® constant]

for 3^rd orbit of He⁺

$v_{H e^{+}} = \frac{k * 2}{3} = \frac{2 k}{3}$ - (1)

$v_{H} = \frac{k * 1}{3} = \frac{k}{3}$ - (2)

$\frac{v_{H e^{+}}}{v_{H}} = 2 : 1$

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Physics Class 12th

Given below are two statements:

Statement I : Davission-Germer experiment establishes, the wave nature of electrons.

Statement II : If electrons have wave nature, they can interfere and show diffraction.

In the light of the above statements choose the correct answer from the option given below:

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Raj Pandey

Contributor-Level 9

Based on theory

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