CBSE > Class 12 > Physics | CBSE Board | Homework Help

Polarization is used in sunglasses to reduce the glare.
Polaroid filters are used in plastic industries for performing stress analysis test.
Three-dimensional movies are produced and shown with the help of polarization.
Polarization is used for differentiating between transverse and longitudinal waves.
Infrared spectroscopy uses polarization.
In Chemistry, the chirality of organic compounds are tested using polarization technique.

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In deriveing amplitude how we take rcos*=asin *

Posted by Himanshu Pandey 6 years, 3 months ago

CBSE > Class 12 > Physics

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3 circular arcs each of radius R and total charge 4q . Find net electric potential at centre of curvature

Posted by Navjot Singh 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Gaurav Seth 6 years, 3 months ago

Figure shows three circular arcs, each of radius R and total charge as indicated. The net elecric potential at the centre of curvature is :

A n s w e r :

Correct option: (A)

Explanation:

V = V₁ + V₂ + V₃

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Defination of TIR

Posted by Radha Devi 6 years, 3 months ago

CBSE > Class 12 > Physics

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Yogita Ingle 6 years, 3 months ago

Total internal reflection is defined as : The phenomenon which occurs when the light rays travel from a more optically denser medium to a less optically denser medium.

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Give any 2 application of cyclotron

Posted by Akriti Bisht 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Mohini Rai 6 years, 3 months ago

it made to produce high velocity and high energy ion

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Sukriti Kalia 6 years, 3 months ago

Cyclotrons can be used in particle therapy to treat cancer. Ion beams from cyclotrons can be used, as in proton therapy, to penetrate the body and kill tumors by radiation damage, while minimizing damage to healthy tissue along their path

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What is the best way to study the last chapter of physics that is dual nature of light and matter , atoms and nuclei etc to score good in board exam , if from you tube channel then which channel is the best???? Or there is any other way to study these chapters?

Posted by Akanksha Dwivedi 6 years, 3 months ago

CBSE > Class 12 > Physics

2 answers

Vemula Chowdary 6 years, 3 months ago

Physics champion is good enough for this lesson

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Leo Arockiasamy 6 years, 3 months ago

For these lessons ncert textbook is enough for board exam

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Draw equipotential surfaces for an electric dipole

Posted by Sheikh Roshni Nesha 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Vijeta Bhadana 6 years, 3 months ago

Here only typing option is there so how can i draw

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Need of modulation

Posted by Vignesh Rohan 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 3 months ago

The needs of modulation for transmission of a signal are given as below: (i) The transmission of low frequency signal needs antenna of height 4-5 km which is impossible to construct. So, there is a need to modulate wave in order to reduce the height of antenna to a reasonable height.

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Ques from Application of gauss theorem : use gauss theorem to find the electric field at a point due to uniformly charged spherical non conducting sphere of radius R.... Where's this one in book... There are just three applications I can't find this please help me out!!!!

Posted by Ayushi Raj 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Vijeta Bhadana 6 years, 3 months ago

This application is on or ques is on ncert eg. 1.13 is same as you asked if you want simplified form of ncert then i can type .

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TIR in equilateral prism

Posted by Nikhil Goswami 6 years, 3 months ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 6 years, 3 months ago

For a normal incidence on any surface of the prism, the transmitted ray makes an angle of 60 degrees which greater than the critical angle of the prism which 42 degrees.
Therefore, there is a total internal reflection. there will be TIR as long as the angle of incidence is greater than 42 degrees on the AC surface (in the given diagram)