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Class 12th

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Class 12th Physics

What was the first postulate stated by Bohr?

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Aadit Singh Uppal

Contributor-Level 10

This theory simply stated that there exist stationary orbits around the nucleus in which electrons rotate without dissipating any type of energy. And if the electrons try to change their orbits, then there will be a gain or loss of energy depending on the situation.

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Class 12th Physics

What is the current through an ideal P – N junction diode shown in figure below?

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alok kumar singh

Contributor-Level 10

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Class 12th Physics Alternating Current

The value of alternating emf (E) in the given circuit will be

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alok kumar singh

Contributor-Level 10

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Class 12th Physics Ray Optics and Optical Instruments

A farsighted person cannot focus distinctly objects closer than 100 cm. The lens that will permit him to read from a distance of 50 cm, will have a focal length:

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alok kumar singh

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Class 12th Physics

Figure shows four plates each of area A and separated from another by a distance d. What is the capacitance between P and Q?

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alok kumar singh

Contributor-Level 10

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Class 12th Physics Electric Charge and Field

A charged particle of mass m and charge q is released from rest in a uniform electric field E. The KE of particle after time t is:

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alok kumar singh

Contributor-Level 10

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9 months ago

Class 12th Physics

The work function of a metal is w₀and l is wavelength of incident radiation. There is no emission of photoelectron when

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alok kumar singh

Contributor-Level 10

For no emission of electron

λ > λ₀

Q λ_{0 =}hc/w_0,so λ > hc/w₀

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9 months ago

Class 12th Physics Wave Optics

Two pillars are at distance of 6.28 m from each other. What should be the maximum distance of an observer from pillar to see them separately?

(qR = 1 arc minute)

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Raj Pandey

Contributor-Level 9

qR =1/60º for human eye

⇒x = 21.6 km

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9 months ago

Class 12th Physics

The work function of a metal is w0 and l is wavelength of incident radiation. There is no emission of photoelectron whenThe work function of a metal is w0 and l is wavelength of incident radiation. There is no emission of photoelectron when\

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Raj Pandey

Contributor-Level 9

For no emission of electron

λ > λ0

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New answer posted

9 months ago

Class 12th Moving Charges and Magnetism

What are different types of electricity?

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Pallavi Pathak

Contributor-Level 10

There are two types of electricity - static and current. The current electricity is divided into Alternating Current (AC) and Direct Current (DC). Based on the production methods, electricity is divided into - heat, chemical, pressure, light and magnetism.

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