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

When light of energy more than forbidden gap energy falls on photodiode electrons hole pair is liberated generation of electron hole is formed near depletion layer and separated by suitable electric fields Then electron move towards n -type and holes toward p - type hence emf is generated

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ANSWER

How does zener diode as voltage regulator please explain in easy words?????

Posted by Kriti Sharma 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Parul Singh 6 years, 1 month ago

Zener diode is voltage regulator as it convert the fluctuating voltage int constant voltage.

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ANSWER

Filter circuit ....?????

Posted by Kriti Sharma 6 years, 1 month ago

CBSE > Class 12 > Physics

6 answers

Rajat Barwar 6 years, 1 month ago

Using capacitor in rectifier.

2Thank You

Tapan Pandey ?? 6 years, 1 month ago

It is used to get pure dc current from current generated by rectifier...?

2Thank You

D K 6 years, 1 month ago

To get steady dc output we use filter ..

2Thank You

J K 6 years, 1 month ago

Drift velocity

0Thank You

Arnav Kandari 6 years, 1 month ago

Kon hai ye log, kaha se aate hai ye.

1Thank You

Ujjwal Thakur 6 years, 1 month ago

Drift velocity

0Thank You

ANSWER

How many marks does numericals appear in exam 2020

Posted by Tanishk Arya Arya 6 years, 1 month ago

CBSE > Class 12 > Physics

17 answers

Tapan Pandey?? 6 years, 1 month ago

Thik h ?

1Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

15 marks... dekh lena.

1Thank You

Gopal Mishra 6 years, 1 month ago

15 marks

0Thank You

Tapan Pandey?? 6 years, 1 month ago

I know but she is not listening me ????????? it's alright just see on the battle day.......??????✍️??????✍️✍️✍️✍️✍️✍️✍️ 02?03?2020✍️??????

0Thank You

Meghna Shrivastav? 6 years, 1 month ago

No numericals 12 marks ka aaiga

1Thank You

Tapan Pandey?? 6 years, 1 month ago

Haa khush .... Aur padhai kaisi chal rhi????

1Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

hnn abb thik hai 15 marks numerical. ?

1Thank You

Tapan Pandey?? 6 years, 1 month ago

Achaa chalo ....ab tum itna kehti ho to maan lete h?????????

1Thank You

Tapan Pandey?? 6 years, 1 month ago

Ni 12 no. Ka numerical h??

0Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

15. mann lo baat ko.. ???

1Thank You

Tapan Pandey ?? 6 years, 1 month ago

12 ?????

2Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

15. ?

3Thank You

Tapan Pandey ?? 6 years, 1 month ago

No 12 only ?

2Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

15 marks approx .

3Thank You

Tapan Pandey ?? 6 years, 1 month ago

12 marks according to new cbse curriculum

5Thank You

J K 6 years, 1 month ago

At list 20marks

0Thank You

Arnav Kandari 6 years, 1 month ago

Many marks. Believe me ??

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ANSWER

Is CHARGING AND DISCHARGING OF CAPACITOR is in our syllabus? If yes, then its in WHICH CHAPTER?

Posted by Gaurav Rawat 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Gaurav Rawat 6 years, 1 month ago

Yaar ncert me mil hi nahi raha. Ye kaunse page par hain?

0Thank You

Ďãřşháñăã Yadav ? ? ? 6 years, 1 month ago

yes it's in syllabus chapter no. 2

0Thank You

ANSWER

What is the basic cause of quantisation of charge?....2 points needed

Posted by ? ? 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Pisuy Dubey 6 years, 1 month ago

Bcoz the are the smallest known

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ANSWER

someone plse help...ihavent practised numericals and only two days left what should i do so that i could solve all the numericals in phy board exam

Posted by Ishika Soni 6 years, 1 month ago

CBSE > Class 12 > Physics

5 answers

Ishika Soni 6 years, 1 month ago

in ray optics which one is very imp topics

0Thank You

Gopal Mishra 6 years, 1 month ago

Don,t do anythinh. Firstly you have study with your notes. Theory portion come exam aprox 50 to 55 marks theory. We suggest that you stydy only theory

1Thank You

Muskaan Vig 6 years, 1 month ago

Solve only numericals from previous years sample papers....

1Thank You

Mahesh M 6 years, 1 month ago

Go through ncert u can understand i was also in ur level but after going through ncert im now a master of solving any hots numerical upto jee main levels

1Thank You

Yuvraj Singh 6 years, 1 month ago

Write all formulas 2..3 times in rough notebook so that you can memorize the formulas in exam.

1Thank You

ANSWER

Are MIRROR SYMMETRY AND FOLDING SYMMETRY METHOD for solving resistance is in our syllabus?

Posted by Gaurav Rawat 6 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

? ? 6 years, 1 month ago

No....its safe to use kirchoff....but equipotential method may be used

0Thank You

Rajat Barwar 6 years, 1 month ago

You would no need them in any question

0Thank You

Rajat Barwar 6 years, 1 month ago

0Thank You

ANSWER

do we get different questions in different sets of same state

Posted by Superchaina N 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Sapna Rana 6 years, 1 month ago

Yes but topics are somehow related

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ANSWER

Sir can i get previous year imp questions

Posted by Sanju Negi 6 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is coherent light

Posted by Kartikesh Jha 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

? ? 6 years, 1 month ago

Coherent light has same frequency, same wavelength ,stable phase difference or no phase difference .

1Thank You

ANSWER

pattern of questions 2020 +3

Posted by Sahil Rajput 6 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Give an example of interference of light in everyday life.

Posted by ? ? 6 years, 1 month ago

CBSE > Class 12 > Physics

8 answers

? ? 6 years, 1 month ago

Thanks all

0Thank You

Muskaan Vig 6 years, 1 month ago

thin film of oil is also an example of interference of light because interference also occurs when light changes its media.

0Thank You

Muskaan Vig 6 years, 1 month ago

Soap bubble is an eg of interference...when white light passes through it, it forms alternate bright and dark fringes of different colours due to which soap is colourful .....

2Thank You

Rajat Barwar 6 years, 1 month ago

Yes, it is soap bubble, and also thin film of oil on water.

1Thank You

Prasann Kumar 6 years, 1 month ago

When light is come from lighthouse To give direction to ship

1Thank You

Riya Rana 6 years, 1 month ago

Idk i read it somewhere....

1Thank You

? ? 6 years, 1 month ago

How?

0Thank You

Riya Rana 6 years, 1 month ago

Soap bubble

1Thank You

ANSWER

Define amplifier in detail

Posted by Vishnu Meena 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

▪▪Amrit▪▪ ❤ 6 years, 1 month ago

Sir ji .........it's not in our syllabus.......

1Thank You

ANSWER

A 12.5 eV beam is used to bombared gaseous hydrogen atom at room temprature what series of wavelenth will be emitted

Posted by Geeta Goyal 6 years, 1 month ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Blueprint of physics?

Posted by Antham Tudu 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Nishant Sharma 6 years, 1 month ago

BLACK AND WHITE PRINTED PAPER WITH INSTRUCTUONS AND PHYSICAL CONSTANTS...4 SECTIONS WITH ABOUT 37Q IN BOTH LANGUAGES!....THANK ME LATER! :)

0Thank You

Abc ?⏳ 6 years, 1 month ago

This time its unitwise waitage....so its here: Chapters. Marks 1,2,3 } 16 4,5,6,7 } 17 8,9,10 } 18 11,12,13 } 12 14 07 U can also check on net...

1Thank You

ANSWER

What is brewsters angle ?

Posted by Daksh Khinchi 6 years, 1 month ago

CBSE > Class 12 > Physics

3 answers

Mahi Singh 6 years, 1 month ago

The incidence angle at which reflected light is completely plane polarized is called Brewster angle. u=taniB

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Prasann Kumar 6 years, 1 month ago

The polarising incidence Angle at which light become ppl

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Mahi Singh 6 years, 1 month ago

u=taniB

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ANSWER

a) For same value of angle of incidence, the angles of refraction in three media are 150, 20° and 25° respectively. In which medium, the velocity of light will be minimum? b) Derive the relationship between angle of incidence, angle of prism and angle of minimum deviation for an equilateral prism.

Posted by Gurmeet Kaur 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Adi Kumar 6 years, 1 month ago

The velocity of light is minimum in the medium with angle of refraction is 20 degrees

0Thank You

ANSWER

Why a electric rod attract light objects?

Posted by Zeenath Rafeek 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Bikash Roy 6 years, 1 month ago

due to the effect of electric field due to charge rod charge can be redidtributed in light object so get attracted

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D K 6 years, 1 month ago

As it induces opposite charge in object

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ANSWER

How to study physics in one day

Posted by Yamini Yadav Yadav 6 years, 1 month ago

CBSE > Class 12 > Physics

2 answers

Yamini Yadav Yadav 6 years, 1 month ago

Really it works as

1Thank You

Sonu Andani 6 years, 1 month ago

only ncert ques all chaptr

1Thank You

ANSWER

Abhi tak physics me kitne chapters ho gaye yaar, dosto?

Posted by Gaurav Rawat 6 years, 1 month ago

CBSE > Class 12 > Physics

4 answers

Param Dhingra 6 years, 1 month ago

3 units?

0Thank You

Ujjwal Jaguri 6 years, 1 month ago

I am only doing sample papers ...... 2 ho gaye hai

0Thank You

Yamini Yadav Yadav 6 years, 1 month ago

1Thank You

Mrs.Alina Ahmed Khan 6 years, 1 month ago

Chl rhe h progress pr h kam

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ANSWER

I am so much scared about physics exam kya koi batega ki m kya adu jise pass ho jau plzzz friends......??

Posted by Mrs.Alina Ahmed Khan 6 years, 1 month ago

CBSE > Class 12 > Physics

5 answers

Udit Sen 6 years, 1 month ago

Aur cyclotron, galvanometer

1Thank You

Sonu Andani 6 years, 1 month ago

ncert ques kar lo

1Thank You

Krishna Singh Yadav 6 years, 1 month ago

Kuh important topic ka video lecher dekha lo ?

3Thank You

Viraj Singh 6 years, 1 month ago

Kuch important topics hai like gauss law application,parallel plate capacitor, potentiometer and its application,biot savart law and its application, faromagnetic, paramagnetic, diamagnetic,faraday law of emi, displacement current, lens makers formula, astronomical telescope,young double slit experiment, energy band diagram for p and n junction diode, half and full wave rectifier inhe pdle bhai easily pass ho jayga

4Thank You

? ? 6 years, 1 month ago

Do all derivations once properly.....then read the formulas and write them in your notebook....practice all diagrams(cyclotron,generator, galvanometer etc)....and do previous year question

2Thank You

ANSWER

Can any one tell me the SI unit of Force??

Posted by Naveen Kumar 6 years, 1 month ago

CBSE > Class 12 > Physics

7 answers

Naveen Kumar 6 years ago

Hey Mr. Arnav !!!! I know the basics very well bas mai tumlogon ka basic clear hai ki nii hai dekh raha tha??

1Thank You

Yamini Yadav Yadav 6 years, 1 month ago

Newton

1Thank You

Riya Rana 6 years, 1 month ago

1Thank You

Mrs.Alina Ahmed Khan 6 years, 1 month ago

10th m hi pda diya jata h

2Thank You

Mrs.Alina Ahmed Khan 6 years, 1 month ago

Yess its very simple

1Thank You

Mrs.Alina Ahmed Khan 6 years, 1 month ago

Newton

1Thank You

Arnav Kandari 6 years, 1 month ago

Abe saale ye to basic hai ye ni ara.

3Thank You

ANSWER

A conducting wire is kept along EW direction and allowed to fall freely. Will any emf be induced in wire? Plz explain

Posted by ? ? 6 years, 1 month ago

CBSE > Class 12 > Physics

1 answers

Muskan Prajapatit 6 years, 1 month ago

yes there will be an emf induced as the horizontal compent of field of earth , velocity of the motion of the wire and the length of the wire are all perpendicular to each other

3Thank You

ANSWER

Draw a schematic sketch of an AC generator and describe its basic elements. State briefly working principle.

Posted by Manisha Rastogi 6 years, 1 month ago

CBSE > Class 12 > Physics