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

When a beam of completely plane polarised light is incident on an analyser, the intensity of transmitter light from the analyser is directly proportional to the square of cosine of the angle between plane if transmission of analyser and polariser.

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Define electric flux its si unit

Posted by Arsh Perwaz 7 years ago

CBSE > Class 12 > Physics

2 answers

Khushi Verma 7 years ago

These are the no.of electric field lines which passing through a surface normally. Si unit is waper

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Shailendra Singh 7 years ago

Columb

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Principles of extramurals

Posted by Sharda Devi 7 years ago

CBSE > Class 12 > Physics

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What is cimmunication setup

Posted by Aniket Mishra 7 years ago

CBSE > Class 12 > Physics

1 answers

Siddhant Gaurav 7 years ago

Transmission of information is called communication Setup - information source-transmitter-receiver-user of information

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Deivation of bohrs magnetism

Posted by Namrata Yadav 7 years ago

CBSE > Class 12 > Physics

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Why p type and n type semiconductors are neutral?

Posted by Deepakshi Dhiman 7 years ago

CBSE > Class 12 > Physics

3 answers

G K 7 years ago

Iska correct ans h, ?n-type semiconductor me pentavalent impurity ko add kiya jata h tetravalent host atom me , then usme 1 e- free bch jata h , now sbko lg rha hoga ki ye neutal kse hua?????BUT ye neutral hi hota h bcoz the impurity atom whole is electrically neutral , so semiconductor is also neutral?.......i hope its clear to u

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G K 7 years ago

Wrong answer by Aaditya...... bhai koi chij neutral tb hoti h when they have = no. of +ve nd -ve charge.....but inme asa ni hota .....p type me +ve majority me hote h , nd n type me -ve charge ......

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N Aaditya 5 years, 10 months ago

In n type semiconductor electron can move freely and are negatively charged but It also has some donor or +ve atoms which make it neutral. Similar and vice versa in p type semiconductor.

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What property of zener diode is used for voltage regulator?

Posted by Deepakshi Dhiman 7 years ago

CBSE > Class 12 > Physics

1 answers

N Aaditya 7 years ago

Zener diode is a diode which works in reverse breakdown region the voltage across it remains constant even for a large change in the current.

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Why ammeter is connected in series and voltmeter in parallel

Posted by Vanshita Jain 7 years ago

CBSE > Class 12 > Physics

1 answers

Deepakshi Dhiman 7 years ago

Because in series current is same thus ammeter is connected in series and voltage is constant in parallel that's why voltage is connected in parallel, another reason to connect ammeter in series is to stop damage of ammeter

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What is the reason behind gravitational force between two particles ?

Posted by Anish Chaubey 7 years ago

CBSE > Class 12 > Physics

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Plzz solve Calculate the shortest wavelength of lyman series.given Rydberg's constant R=10967700/m.

Posted by Suhani Rana? 7 years ago

CBSE > Class 12 > Physics

1 answers

Saumya Agrawal 7 years ago

Take n1 as 1and n2 as infinity and put them in formula......

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Relation between potential energy and kinetic energy

Posted by Jitender Kumar 7 years ago

CBSE > Class 12 > Physics

1 answers

Siddhant Gaurav 7 years ago

The energy due to height is called potential energy eg- if we throw a ball in air The energy due to motion is called kinetic energy eg- a running car

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Why number of proton is not greater than number of neutron in nucleus

Posted by Rahul Choudhary 7 years ago

CBSE > Class 12 > Physics

1 answers

Jitender Kumar 7 years ago

To provide stability to atom

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State Fleming right hand rule

Posted by Arnav Singh 7 years ago

CBSE > Class 12 > Physics

1 answers

Saumya Agrawal 7 years ago

When index finger is in direction of magnetic field and middle finger is in direction of current then thumb will show the direcrion of force this is left hand rule......

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Definition of radius of gyration ?

Posted by Shivam Vashist 7 years ago

CBSE > Class 12 > Physics

1 answers

Kuttima Purusothman 7 years ago

Radius of gyration of a body about an axis of rotation is defined as the radial distance of a point from the axis of rotation at which, if whole mass of the body is assumed to be concentrated, its moment of inertia about the given axis would be the same as with its actual distribution of mass

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When an electron in hydrogen atom jump from the exicted state to the ground state how wouldthe de broglie wavel length assoicated with the electron change .justify your answee

Posted by Prachi Sharma 7 years ago

CBSE > Class 12 > Physics

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What is semicondutor

Posted by Vivek Yadav 7 years ago

CBSE > Class 12 > Physics

1 answers

Gaurav Seth 7 years ago

Semiconductors : These are the solids with conductivities in the intermediate range from 10–6 to 104 ohm^–1m^–1.

In case of semiconductors, the gap between the valence band and conduction band is small Therefore, some electrons may jump to conduction band and show some conductivity. Electrical conductivity of semiconductors increases with rise in temperature, since
more electrons can jump to the conduction band. Substances like silicon and germanium show this type of behaviour and are called intrinsic semiconductors.
The conductivity of these intrinsic semiconductors is too low to be of practical use. Their conductivity is increased by adding an appropriate amount of suitable impurity. This process is called doping.

There are two types of semiconductor
i) n- type semiconductor
ii) p- type semiconductor

Element of group14 of the periodic table, when doped with a group 15 element like P or As, Four out of five electrons are used in the formation of four covalent bonds with the four neighbouring silicon atoms. The fifth electron is extra and becomes delocalised.

These delocalised electrons increase the conductivity of doped silicon (or germanium). Here the increase in conductivity is due to the negatively charged electron, hence silicon doped with electron-rich impurity is called n-type semiconductor.

p-type :

Silicon or germanium can also be doped with a group 13 element like B, Al or Ga which contains only three valence electrons. The place where the fourth valence electron is missing is called electron hole or electron vacancy. This hole can be act as charge carrier in the lattice. This known as p - type semiconductor.

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In what way is diffraction from each slit related to the interference pattern in a double slit experiment.?

Posted by Astha Rajpoot 7 years ago

CBSE > Class 12 > Physics

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Single slit diffraction pattern kese yaad rkhe? Its very tough to learn it.?

Posted by Soumik Saha 7 years ago

CBSE > Class 12 > Physics

1 answers

Dev Pratap Singh 7 years ago

Learn it by practicing more and more times till you get it

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How much percent we can easily get in board exam if we know basic concepts ?

Posted by Mohit Singh 7 years ago

CBSE > Class 12 > Physics

1 answers

Akshay Mahant 7 years ago

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why zener diode connected in Reverse bias

Posted by Aman Kumar 7 years ago

CBSE > Class 12 > Physics

1 answers

Adarsh Pathak 7 years ago

Zener diode is heavly dopped in both p and n side so for forward biased its behaviour is same but in reverse biased the junction potential increased

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Friends how many sleeping hours do you have

Posted by Abc Kamboz 7 years ago

CBSE > Class 12 > Physics

2 answers

Adarsh Pathak 7 years ago

7 hours

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Prit Gajera 7 years ago

6 hours

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Important numericals related to optics

Posted by Geeta Devi 7 years ago

CBSE > Class 12 > Physics

1 answers

Siddhant Gaurav 7 years ago

Search important theory and derivation by aman dhattarawal on youtube description m link hoga download krlena

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Huygen's principle and law of refraction

Posted by Jagmeet Brar Mahla 7 years ago

CBSE > Class 12 > Physics

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Derive an expression for magnetic dipole moment of an electron around a nucleus. What is bohr magneto??

Posted by Anchal Kumari 7 years ago

CBSE > Class 12 > Physics

2 answers

Shubham Sharma 7 years ago

m = neh/4πm The value of eh/4πm = 9.27× 10^-24 Am^2 is known as bohr' s magneton

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Mahavir Kumar 7 years ago

√n×n+2 BOHR MAGNETON IS ITS UNIT BBU

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Describe optical fibre

Posted by Geeta Devi 7 years ago

CBSE > Class 12 > Physics

1 answers

Yogita Ingle 7 years ago

Optical fiber is the technology associated with data transmission using light pulses travelling along with a long fiber which is usually made of plastic or glass. Metal wires are preferred for transmission in optical fiber communication as signals travel with fewer damages. Optical fibers are also unaffected by electromagnetic interference. The fiber optical cable uses the application of total internal reflection of light. The fibers are designed such that they facilitate the propagation of light along the optical fiber depending on the requirement of power and distance of transmission. A single mode fiber is used for long-distance transmission while a multimode fiber is used for shorter distances. The outer cladding of this fibers needs better protection than metal wires.

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What are the important derivation in the chapter communication system??

Posted by Rathin Goswami 7 years ago

CBSE > Class 12 > Physics