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

Using mirror formula-1/f=1/u+1/v ..for convex lens f is positive ....u is always negative..due to this v comes out to be positive....hence it forma virtual image...

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Explain the priciple construction and working of cyclotron?

Posted by Rukhsana Khatoon 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Pritish Mishra 6 years, 1 month ago

It works on the principle that frequency of revolution of a charged particle in a uniform magnetic field is independent of its kinetic energy

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Young's double slit

Posted by Ankit Yadav 6 years, 1 month ago

CBSE > Class 12 > Physics

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Complete ho gya sbka...??

Posted by Shalini Singh 6 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Shalini Singh 6 years, 1 month ago

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Amit Kushwaha 6 years, 1 month ago

Na bro

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Snehal Bhawalkar 6 years, 1 month ago

Not at all....tumhara?

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10th ke jese paper leak to nhi hua kisi ka?

Posted by Suyash Kulshrestha 6 years, 1 month ago

CBSE > Class 12 > Physics

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Important question from chapter alternating curret

Posted by Shweta Mahant 6 years, 1 month ago

CBSE > Class 12 > Physics

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????????????????????

Posted by Kriti Sharma 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Vani Shankhwar 6 years, 1 month ago

When an unpolarized light incident on a refracting surface at polarising angle (Brewster angle) then refractive index of corresponding mediums is equal to tangent of polarising angle. u(meu)=tan ip

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Faraday's laws statements

Posted by Samra Naqvi 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Pritish Mishra 6 years, 1 month ago

A/c to Faraday law "The magnitude of induced emf is directly proportional to the rate of change of magnetic flux through the circuit"

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How to find electric field

Posted by C Nals 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Deepak Kumar 6 years, 1 month ago

region around a charged particle or object within which a force would be exerted on other charged particles or objects.

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use biot-savart's law to obtain the expression for the magnetic field at an axial point distance D from the centre of a circular coil of radius a carrying current I also find the ratio of the magnitude of the magnetic field of this coil at the centre and at an axial point for which d=a√3

Posted by Deepak Kumar 6 years, 1 month ago

CBSE > Class 12 > Physics

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Why are eddy currents considered undesirable in a transformer and how are they reduced in such devices

Posted by Hitesh Varshan M 6 years, 1 month ago

CBSE > Class 12 > Physics

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Brewsters law????????????????????

Posted by Kriti Sharma 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Rajat Barwar 6 years, 1 month ago

tani= n/m, n= ref. index of medium 2, m= ref. index of medium 1.

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Rajat Barwar 6 years, 1 month ago

At a certain angle of incidence for two media,after reflection the light becomes plane polarized. This angle is called brewster's angle. Hope this may help u...

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Lense maker drevation

Posted by Neeraj Rautela 6 years, 1 month ago

CBSE > Class 12 > Physics

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Why does a paramagnetic sample display greater magnetisation when cooled ? explain. ✍️✍️✍️✍️

Posted by Tapan Pandey?? 6 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

iski avashykta nhi.???

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Tapan Pandey?? 6 years, 1 month ago

Dhanyawad?

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Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

this is becoz the tenancy to disrupt the alignment of dipoles arising from random thermal motion is reduced at lower temperature.

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Hello Aku bhai !

Posted by Aditya Chauhan 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Kriti Sharma 6 years, 1 month ago

Right lakshay??????????

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Lakshya ? 6 years, 1 month ago

Bhai pd le...yh hii hello exam k bad kr lena...

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Dad kis kis ko ??laga rha hai

Posted by Khushi Singh 6 years, 1 month ago

CBSE > Class 12 > Physics

5 answers

Deepak Kumar 6 years, 1 month ago

Best of luck

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Lakshya ? 6 years, 1 month ago

Dar k agee jit hai...??

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Shubham Lathwal 6 years, 1 month ago

Jaat ke balak na daaraa karte....

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Aditya Chauhan 6 years, 1 month ago

Ek video dekho sab nikal jayega

2Thank You

Aku❤️❤️ ? 6 years, 1 month ago

Meeeeeeee???

2Thank You

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Weightage of chapters?

Posted by Manveer Kaur 6 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

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Best of luck for your upcoming physics exam??

Posted by Navneet . 6 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Aku❤️❤️ ? 6 years, 1 month ago

Same to u siso

1Thank You

Aditya Chauhan 6 years, 1 month ago

Same 2 u

1Thank You

Naina20 Tiwari 6 years, 1 month ago

Thanku

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All chapter multiple choice question

Posted by Rakesh Chaurasiya 6 years, 1 month ago

CBSE > Class 12 > Physics

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the percentage of incident unpolarized light passing through the two nicol prism oriented with their principal planes making an angle theta is 25 find the value of theta

Posted by Arti Vea 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Rajat Barwar 6 years, 1 month ago

I think it is 45°.

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Name the properties of a magnetic material that makes it suitable for making 1.) A permanent magnet 2.) A core of an electromagnet.✍️✍️✍️✍️?

Posted by Tapan Pandey?? 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

1) permanent magnet ? high retentivity, high coercivity and high permeability. (2) core of electromagnet ? high initial permeability, low hysteresis, low resistivity.

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Relationship between threshold frequency, frequency of incident photon and cutoff potential??

Posted by Nishkarsh Bora 6 years, 1 month ago

CBSE > Class 12 > Physics

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Davisson and germer experiment?????????????

Posted by Kriti Sharma 6 years, 1 month ago

CBSE > Class 12 > Physics

8 answers

Tapan Pandey?? 6 years, 1 month ago

Are you mad??...@aditya

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Aditya Chauhan 6 years, 1 month ago

???pagely mai toh pyaar baat raha tha I am not in board this year ??

1Thank You

Aku❤️❤️ ? 6 years, 1 month ago

Jada ho gaya bhai pehle pass ho ja

1Thank You

Aditya Chauhan 6 years, 1 month ago

Then one day i will give you a lot of roses

1Thank You

Kriti Sharma 6 years, 1 month ago

I love roses

1Thank You

Aditya Chauhan 6 years, 1 month ago

Davisson and Germer Experiment, for the first time, proved the wave nature of electrons and verified the de Broglie equation. de Broglie argued the dual nature of matter back in 1924, but it was only later that Davisson and Germer experiment verified the results. The results established the first experimental proof of quantum mechanics. In this experiment, we will study the scattering of electrons by a Ni crystal. Let’s find out more.

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Aditya Chauhan 6 years, 1 month ago

The experimental setup for the Davisson and Germer experiment is enclosed within a vacuum chamber. Thus the deflection and scattering of electrons by the medium are prevented. The main parts of the experimental setup are as follows: Electron gun: An electron gun is a Tungsten filament that emits electrons via thermionic emission i.e. it emits electrons when heated to a particular temperature. Electrostatic particle accelerator: Two opposite charged plates (positive and negative plate) are used to accelerate the electrons at a known potential. Collimator: The accelerator is enclosed within a cylinder that has a narrow passage for the electrons along its axis. Its function is to render a narrow and straight (collimated) beam of electrons ready for acceleration. Target: The target is a Nickel crystal. The electron beam is fired normally on the Nickel crystal. The crystal is placed such that it can be rotated about a fixed axis. Detector: A detector is used to capture the scattered electrons from the Ni crystal. The detector can be moved in a semicircular arc as shown in the diagram above.

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Aditya Chauhan 6 years, 1 month ago

Propose day over then why these many rose!

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