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

Semiconductors with band gap close to 1.5eV are ideal materials for solar cell fabrication....imp criteria: 1-band gap 2-high optical absorption 3-electrical conductivity 4-availability of raw material 5-cost

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What do you mean by photoelectric effect???

Posted by P Bhardwaj 8 years ago

CBSE > Class 12 > Physics

5 answers

Khyati Dave 8 years ago

Emission of photoelectrons from the surface of metal when light beam of suitable frequency is incident on it.

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Harshit Tiwari H 8 years ago

Ejection of electron from surface of metal if light of energy more than work function of metal

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Vineet Kumar Gupta 8 years ago

hv = E . hence engery of light is responsible for this phenomenon but as E directory propositional to v (frequency ) we say that

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Dolly Singh 8 years ago

Of suitable frequency

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Vineet Kumar Gupta 8 years ago

ejection of photoelectrons when a light caring enough energy strikes a surface

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Kya mai CBSE guide padh kar pass ho sakta hu kya . physics me.?

Posted by Rahul Kumar 8 years ago

CBSE > Class 12 > Physics

5 answers

Yuthika Yadav 8 years ago

Gussa nahi kar rahi just telling........... I m in jnv Bijnor ????????

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Radhika Tyagi 8 years ago

Gud.... Pr gussa kyu kr rhi h

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Yuthika Yadav 8 years ago

They're also government skuls

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Yuthika Yadav 8 years ago

Kyu government skul ke bachhe hi Kya cbse guide padhte hai ???? Primary skul ko chod kar jnv and kv are one of the best skul made in India far better than private ones

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Dolly Singh 8 years ago

Govt.. School ka hai kya tu

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What is electric field intensity ?

Posted by Ankur Pathak 8 years ago

CBSE > Class 12 > Physics

2 answers

Somya Kothari 8 years ago

Electric field intensity is the strength of an electric field at any point

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Vineet Kumar Gupta 8 years ago

EFI may be defined as force experienced by a unit positive test charge under the influence of an electric field due to an stationary source chargw

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Pls.... Tell me about important topics of chapter 12 atom and chapter 13 nuclei

Posted by Dolly Singh 8 years ago

CBSE > Class 12 > Physics

1 answers

Your Principal 8 years ago

"ATOM "-Alpha particle scattering experiment;Rutherford 's model of atom;Bohr model ;energy level's;hydrogen spectrum. "NUCLEI"-Composition and size of nucleus; Radioactivity;alpha beta and gamma particles/rays and their properties;Radioactive decay law. Mass-energy relation;mass defact;binding energy per nucleons and it's variation with mass number ;nuclear fission and fusion.

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Easy way to learn right hand thumb rule

Posted by Aman Tiwari 8 years ago

CBSE > Class 12 > Physics

3 answers

Radhika Tyagi 8 years ago

Whatever u both r telling is Fleming's right hand rule....

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Yadwinder Singh Aujla 8 years ago

Short form is FBI which stands for force magnetic field and current according to perpendicular finger this is the easy way to study

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Your Principal 8 years ago

Using your right hand, point your index finger in the direction of the charge's velocity, v(recall conventional current). Point your middle finger in the direction of the magnetic field B. Now,your thumb in the direction of the magnetic force,F magnetic.

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What is self inductance in simple words

Posted by Aman Tiwari 8 years ago

CBSE > Class 12 > Physics

1 answers

Ananya Saw 8 years ago

It is defined as the total magnetic flux per unit current is called self inductance. Its SI unit is Henry. L= magnetic flux/ I Where I- Current

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What is eddy current simple meaning

Posted by Aman Tiwari 8 years ago

CBSE > Class 12 > Physics

2 answers

Your Principal 8 years ago

Eddy current is a loopl of electrical currents induced within conductors by a changing in magnetic fields of conductors due to Faraday's Laws of induction.

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Radhika Tyagi 8 years ago

A swirling current produced in the bulk of a conductor when magnetic flux linked with it changes..

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What is the ce configuration characteristicks

Posted by Nave Kumar 8 years ago

CBSE > Class 12 > Physics

1 answers

Your Principal 8 years ago

In common emitter configuration, base is the input terminal,collector is the output terminal and emitter is common terminal for both input and output terminal. A common emitter (ce)amplifier is used when large number of current gain is needed.

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Sjskekebdk b dksidbdbjdidbedjieieb

Posted by Chetan Anand 8 years ago

CBSE > Class 12 > Physics

0 answers

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Is it necessary to start paper from section A or we can start from section D???

Posted by Rida Khan 8 years ago

CBSE > Class 12 > Physics

1 answers

Radhika Tyagi 8 years ago

Whichever u feel comfortable

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How many angle of incidence are possible when the angle of deviation is minimum?

Posted by Thoudam Barlin 8 years ago

CBSE > Class 12 > Physics

2 answers

Harshit Tiwari H 8 years ago

If angle of incidence is equal to angle of emergence daviatn is minimum

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Dolly Singh 8 years ago

If incident ray is parallal to base of prism then the angle of deviation is minimum

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Explain the effect of increase of frequency

Posted by Thoudam Barlin 8 years ago

CBSE > Class 12 > Physics

2 answers

Your Principal 8 years ago

Increasing frequency the electrons emitted will have a higher kinetic energy (they will move faster). Increasing intensity will increase number of electrons emitted but not their speed.

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Anush Kailash 8 years ago

Increase in frequency results is increase in kinetic energy of electrons which r emmited from the metal..it does not change the number of electrons emitted from the metal...thus stopping potential varies for lights having different freq...but saturation remains constant as it depends only on number of electrons emitted

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In H atom , an electron undergoes transition from second excited state to first excited state and then to ground state. Identify to which series they transition belong.

Posted by Prerna Bhendarkar 8 years ago

CBSE > Class 12 > Physics