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Aarzoo Saini 2 days, 16 hours ago

Do smart work
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Himanshu Rajput 1 day, 17 hours ago

Tum Brahman ho ki kya ho pgl ho

Himanshu Rajput 1 day, 23 hours ago

Plzz yaar 🙏

Himanshu Rajput 2 days, 3 hours ago

Ok but where r u from

Vartika 2 days, 20 hours ago

<font face ="Times New Roman">Nobody asked.
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Mahak Mahak 5 days, 16 hours ago


Vartika Pandey 5 days, 17 hours ago

Please give me full explanation of the question it's urgent

Himanshu Rajput 5 days, 17 hours ago

Vartika where r u from
Lens maker formula apply karo..

Prakash Kumar 1 week, 1 day ago

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Preeti Dabral 1 week, 3 days ago

Prisms can be made from any material that is transparent to the wavelengths for which they are designed. Typical materials include glass, plastic and fluorite.

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Preeti Dabral 2 weeks, 3 days ago

Kinetic energy gained by charged particle of charge q when accelerated under a potential difference V will be KE=qV
For a given V,KE∝q
For proton, deuteron and α-particle the ratio of charges is 1:1:2

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Preeti Dabral 2 weeks, 2 days ago

Results of Project to investigate the dependence of angle of deviation on angle of incidence using a hollow prism filled one by one with different transparent liquids is as follows;


The angle of minimum deviation for –

Water D = 23⁰C

Kerosene oil D = 33⁰C

Turpentine oil D = 32⁰C


The refractive indices of the-

Water n = 1.32

Kerosene oil n = 1.46

Turpentine oil n = 1.44


Speed of light in-

Water v = 2.3x10 m/s

Kerosene oil v = 2.05x10 m/s

Turpentine oil v = 2.08x10 m/s

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Adithya Dev A 2 weeks, 4 days ago

Zero. P = 1/f = (n of liquid/n of glass - 1) 1/R1 + 1/R2 = (1.5/1.5 - 1) 1/R1 + 1/R2 = 0.
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Preeti Dabral 2 weeks, 4 days ago

Sophie was a dreamer who often made up stories for herself and for others. One possibility might be that she wanted to escape the squalor of daily life with the help of her fantasies. Her encounter with Danny Casey was a made-up story for the sake of catching her brother’s attention. Eventually, she gets so much engrossed in it that she starts to live the fantasy. When Danny Casey does not arrive for the second ‘date’, she experiences disappointment. However painful and disappointing her fantasy might be, she was not willing to accept reality. Her dreams and disappointments are figments of her imagination.

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Adithya Dev A 2 weeks, 4 days ago

In electromagnetic waves, the direction of oscillation of the accelerated source charged particle is perpendicular to the direction of propagation of the wave. This is called the transverse nature of electromagnetic waves. In other words, the alternating electric and magnetic fields produced as a result of oscillation of the particle are mutually perpendicular to each other and to the direction of propagation of the wave.

Mr. Chouhan Chouhan 3 weeks, 3 days ago

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Ritesh Rai 3 weeks, 1 day ago

Hme bhi send kr do bhai

Rounak Anand 3 weeks, 2 days ago

Bhai apna phone no. Do na

Sagar Panchal 3 weeks, 5 days ago

Yes bhai
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Divya. Kumari 3 weeks, 4 days ago


Prakash Kumar 3 weeks, 5 days ago


Priya Kumari 3 weeks, 5 days ago

Notes ch 1
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Kashu Verma 1 month ago

The lens maker formula is 1/f=(u-1)[1/R^1-1/R^2]
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Preeti Dabral 2 weeks, 1 day ago

Photoelectric effect: When certain metals are exposed to a beam of light, the electrons are ejected from the metal. This phenomenon is called the photoelectric effect. The electrons ejected are called photoelectrons.

The results of this experiment were:

  1. The electrons are ejected from the metal surface as soon as the beam of light strikes the surface, i.e., there is no time lag between the striking of the light beam and the ejection of electrons from the metal surface.
  2. The number of electrons ejected is proportional to the intensity or brightness of the light.
  3. For each metal; there is a minimum frequency, {tex}\nu_o{/tex} below which photoelectric effect is not observed.
  4. K.E. of electrons {tex}\propto{/tex} frequency of light.

Equipment for studying the photoelectric effect. Light of a particular frequency strikes a clean metal surface inside a vacuum chamber. Electrons are ejected from the metal and are counted by a detector that measures their kinetic energy:

Explanation of photoelectric effect on the basis of quantum theory: When a photon of sufficient energy strikes an electron in the atom of the metal, it transfers its energy to the electron and the electron is ejected without delay. Greater the energy of the photon, greater will be the kinetic energy of the ejected electron.

CBSE Class 12 physics Important Questions Chapter 14 Electronic Devices 1 Mark Questions 1.Give the ratio of number of holes and the no. of conduction electrons in an intrinsic semiconductor. Ans.(As in intrinsic semiconductor ne = nh) 2.What type of impurity is added to obtain n-type semiconductor? Ans. Pentavalent atoms like Arsenic (As) 3.Doping of silicon with indium leads to which type of semiconductor? Ans.Indium is a trivalent impurity, thus doping of silicon with indium leads to p-type semiconductor. 4.Draw an energy level diagram for an intrinsic semiconductor? Ans.In intrinsic semiconductor (ne = nh) 5. A semiconductor has equal electron and hole concentration of. On doping with a certain impurity electron concentration increases to. Identify the type of semiconductor after doping? Ans.As ne > nh, thus resulting semiconductor is of n-type. 6.How does the energy gap of an intrinsic semiconductor vary, when doped with a trivalent impurity? Ans. When a trivalent impurity is added to an intrinsic semiconductor, an acceptor energy level is created in the forbidden energy gap which lies above the valence band. Due to this electrons easily transformed to the acceptor energy level. 7. How does width of depletion layer of p.n junction diode change with decrease in reverse bias? Ans.Decrease in reverse bias will decrease in width of the depletion layer. 8. Under what condition does a junction diode work as open switch? Ans. A junction diode works an open switch when it is reverse biased. 9. Which type of biasing gives a semiconductor diode very high resistance? Ans.Reverse biasing
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Aditi Sharma 1 week, 4 days ago


Akshatha E K 1 month ago


Akshatha E K 1 month ago


Vartika 1 month ago

<font face ="Times New Roman">When you sense that you have to give 12 boards in 4 months and you have studied nothing

Punit Chouhan 1 month, 1 week ago

No it is part of syllabus
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