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

1.Waves at higher frequencies can carry more data than the waves at low frequency. 2. Smaller geographical interference between neighboring stations. 3. Less radiated power. 4. Well defined service areas for given transmitter power.

2Thank You

ANSWER

Using photon pictures of light show how Einstein photoelectric equationcan be established

Posted by Soniya Thakur 7 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Change in weight of man 50 kg move from pole to equator

Posted by Tarun Rao 7 years, 10 months ago

CBSE > Class 12 > Physics

3 answers

Chhavi Verma 7 years, 10 months ago

Weight will be less at equater as centrigugal force is exerted due to rotation of earth

0Thank You

Lekha Raj 7 years, 10 months ago

I think an object would weigh 0.5% more at poles than at equator.

2Thank You

Lekha Raj 7 years, 10 months ago

I think ans should be that the acceleration due to gravity changes according to location.It has higher value at poles than at equator.This simply implies that man would weigh more at pole than equator. W= mg...................From this formula when 'g' inc , the weight of any object automatically inc.

1Thank You

ANSWER

Why there is a need for displacement current?

Posted by Lekha Raj 7 years, 10 months ago

CBSE > Class 12 > Physics

5 answers

Prachi K 7 years, 10 months ago

Pleasure is mine dear?

0Thank You

Lekha Raj 7 years, 10 months ago

Thanq u veryyyy much prerna

1Thank You

Prachi K 7 years, 10 months ago

Ampere circuital law for conduction current during charging of a capacitor was found inconsistent therefore maxwell modified circuital law and introduced displacement current... I m so sure ye ans shi h tm yaad kr lo ise

1Thank You

Prachi K 7 years, 10 months ago

Why don't uh see these ans on net.. Just simple google

0Thank You

Lekha Raj 7 years, 10 months ago

Please help me

0Thank You

ANSWER

What d hell U guys are making in this app...Plzzz study and let others also...And if u all are not interested in studying than don't disturb us...becoz we are finding it difficult to search questions due to ur wasteful chats...??

Posted by Bhumi Jain 7 years, 10 months ago

CBSE > Class 12 > Physics

35 answers

Abc Efg 7 years, 10 months ago

Bir domuz tarafından öldürüleceksin .. bütün gece korkunç bir şekilde uyuyorsun ..

0Thank You

Abc Efg 7 years, 10 months ago

.. u r anlamsız .. asla iyi bir kız ol deme..??

0Thank You

Prachi K 7 years, 10 months ago

Smjha rahe h sabko smjh me nhi aa raha h ki bich me na bolo...kahe ko randipana kr rhi h sab...jyada chodane ka shok chada h re bhosdiwali ABC gf,komii,bhumi, or meri piggy Swati k liye h ye

0Thank You

Prachi K 7 years, 10 months ago

Abcdefg betichod meko maregi gaad me dum h re

0Thank You

Abc Efg 7 years, 10 months ago

Or tu jitna Gali deri h na.. sb Tere ko Mubarak..... bewakuf

0Thank You

Abc Efg 7 years, 10 months ago

Tere jasi ko to yaha is aap me hona hi ni Tha.. bewakuf... Jaa jaake road me bhikh man..u r most disgusting person in this world... Bloody...

0Thank You

Abc Efg 7 years, 10 months ago

Or tu prerna apne aapko smjti kya h.. jada Gali dena aagya to...na jaake ghr me de.. yaha nii..jada oversmrt bnne ki Koi jarur nahi h smjii.... Tu na ldki ke naam pe kalnk h.. kalnk..... Bloody duffer... Tamj SE reh smjii... Etna marungii na Tere ko.. pura daath bahar aajaega... ...

0Thank You

Abc Efg 7 years, 10 months ago

How dare you prerna.. nonsense bloody idiot.. Jaake apne Bhai behen ko gaali de smji..... Tu apne skul me skti h ki ghr me.. idiot... Bloody.. bewakuf.......bada aaii.. Tera naam prerna Kon rekh diyaa bchpn SE gali hi rakhdena thaa . Itna gaali deti h..ab fir se kuch na kuch to bolegi tu bloody.. kyoki Mirchi to laga hi hogaa. Aajj na jaa ke agr me Dena gali.. smjii.. bewakuf.. bloody.. nonsense...duffer..

0Thank You

Prachi K 7 years, 10 months ago

Correct??

0Thank You

Divya Sen 7 years, 10 months ago

Bhumi n komii tumdono dost ho mere isliye bol rhi hu yr plz q ye sb me pd rhe ho tum log... gali de rhe h log to achha lg rha h kya ye swati or prerna ka fight horha h chhodo na un dono ko ldne do tumlog mt pdo ye sb me yhi better h aur koi comments kre uspe b mt dhyn do na yr tumlog

1Thank You

Prachi K 7 years, 10 months ago

Tu tamiz se baat krne Layak hi nhi h buzzy komii

0Thank You

Prachi K 7 years, 10 months ago

Ale le le bhumi ko gussa aagya ...bol rhi hu na panga na le

0Thank You

Bhumi Jain 7 years, 10 months ago

Tumhe baat krne ki tamizz nii h kya

0Thank You

Bhumi Jain 7 years, 10 months ago

How dare u Prerna to talk wid her lik this...tumhe koi haq nii h kisiko aisa bolne ka..Aur gawar to tum ho hi chahe tum maano ya na maano...

0Thank You

Prachi K 7 years, 10 months ago

Mind in your f u c k I n g business bhumi aur komii jabrdasti ka tang nhi adao...ye fight meri aur us piggy Swati ka h

0Thank You

Prachi K 7 years, 10 months ago

Bhag bhsdi ke komii

0Thank You

Prachi K 7 years, 10 months ago

Mjhe v batao na is app ka rule??..kommii

0Thank You

Prachi K 7 years, 10 months ago

Nisha tmhe bhi include hona h kya jabardasti naak mat ghusao

0Thank You

Abc Efg 7 years, 10 months ago

Vahi too..

0Thank You

Bhumi Jain 7 years, 10 months ago

Shayad glti se iska naam prerna rakha gya hoga??

0Thank You

Abc Efg 7 years, 10 months ago

Or prerna.. bada aai Kya bolri thi.. ki Mera naam prerna h.. prerna dene layak... Ah.. disgusting....tum to vivet SE bhi battr ho

0Thank You

Abc Efg 7 years, 10 months ago

Hey!!! Miss prerna..... I was thinking that u r the nice girl but... I. Was wrong u r Even more disgusting than all the disgusting people in the world.. How dare you to post this... .. you don't know the rules of this app.... Or na jaake.. apna words kisi or ko bolna... Pehle apne ap ko dekh upr Swati ke bare me tu kya post ki h... Bloody nonsense.... .... Tum jasi Ladkiyo ke wajh SE sb ka naam kharab hota h...

0Thank You

Bhumi Jain 7 years, 10 months ago

Tumhare way of talking se to nii lgta ki tum female ho..

0Thank You

Nisha Beniwal 7 years, 10 months ago

Bhumi n prerna ab bhi tum tym pas kr rhe ho That tym for ur study not fight!! 2- Idiots ??

0Thank You

Prachi K 7 years, 10 months ago

Are bhumi mai doggie kaise ho skti Dogie to male hota mai to female hu..tm to sach me gawar nikli

0Thank You

Bhumi Jain 7 years, 10 months ago

App me questions tum logo ke wajah se nii milte h.. questions bahaut saare h...And mind ur language... Aur tumhare jaise logo se baat krne ka time nii h mere paas...Gawar hogi tum.. Gaon waali..Dogiee

0Thank You

Prachi K 7 years, 10 months ago

Aur kon sa is app me mahan ques rahta h Jo tm dhundte rahti hu...na to is app koi dhang ka ques rahta h aur nahi answer lekin tm to ho gawar identify krne ka sense nhi

0Thank You

Prachi K 7 years, 10 months ago

Oye listen so called padhaku jitni tu padhai kr rhi h n use kam mai nhi kr rhi bs ye alg baat h ki tmlogon KO show off krne ki habit h...aur tmhare reply dekhe kr aisa lg raha tjhe knowledge ki jyada jrurat h..haha..to lecture kam de aur padhai kr..aur baat to aise kr rhi h jaise duniya bhar ka padhai isi app se kr rhi h..to dikhawa khi aur kr jake

0Thank You

Bhumi Jain 7 years, 10 months ago

Behnji...aap ke paas koi kaam nii h kya...sirf durso ko utlta sidha bolne ke siway...Tum na chup hii raho..kyunki tumhare chats pdhe maine,pure waste...aur padhai me na tum dhyan do kyunki tum jo dinbhar app me timepass kr rahi ho usse dekh ke lgta h ki tumhe pdhai ki zyaada jarurat h...Aur tum log ke iss chats ke wajah se hume questions search krne me prblm hoti h...

1Thank You

Prachi K 7 years, 10 months ago

Mata jii...itna lamba lamba post krne me apka time waste nhi ho raha...chup chap se apna padhai kijiye na

1Thank You

Bhumi Jain 7 years, 10 months ago

So frnds plzz don't waste time in chatting...

3Thank You

Urvashi S 7 years, 10 months ago

Yup, bhumi you are right ?

0Thank You

Pranjali Mahajan 7 years, 10 months ago

Actually

0Thank You

Abc Efg 7 years, 10 months ago

Well u r right..

1Thank You

Abc Efg 7 years, 10 months ago

Omg bhumii...

1Thank You

ANSWER

Metal detector

Posted by Sarat Kumar 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Aisha Grewal 7 years, 10 months ago

Really I also don't know this.. Thanks

0Thank You

Pranjali Mahajan 7 years, 10 months ago

Works on the principle of resonance

0Thank You

ANSWER

if l be the length of a bar magnet then it's separation between two pole is

Posted by Saurav Singh 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Pranjali Mahajan 7 years, 10 months ago

It will be less than length l

0Thank You

ANSWER

How to find magnetic field direction

Posted by Sujata Singh 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Chhavi Verma 7 years, 10 months ago

Right hand thumb rule

1Thank You

Ankit Chauhan Rajput 7 years, 10 months ago

Right hand thumb rule

0Thank You

ANSWER

Uses of OR gate in practical life ?

Posted by Aryan Singh 7 years, 10 months ago

CBSE > Class 12 > Physics

4 answers

Aryan Singh 7 years, 10 months ago

It was used in door bell

0Thank You

Aryan Singh 7 years, 10 months ago

Abe tu pagal hai kya ,aata hai toh bta nhi toh chup reh...

0Thank You

Prachi K 7 years, 10 months ago

Abe chomu syllabus ka pura padh liye ho kya useless ques puch rhe ho..syllabus ka pehale padho n

0Thank You

Ritu Gupta 7 years, 10 months ago

Yess i also want to know

1Thank You

ANSWER

how many questions are repeated in physics 12 board CBSE.. If I do Last 10 year question how many marks I get??

Posted by Prachi Aryan 7 years, 10 months ago

CBSE > Class 12 > Physics

3 answers

Ankit Chauhan Rajput 7 years, 10 months ago

Will pass

0Thank You

Ujjawal Sharma 7 years, 10 months ago

But some are very tricky

2Thank You

Bhumi Jain 7 years, 10 months ago

May be 80%

2Thank You

ANSWER

12th class practical topic

Posted by Niket Jha 7 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Kya mam 2018 ka exam class12 mey ncert sey aaata h kya

Posted by Hariom Shakya 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Ujjawal Sharma 7 years, 10 months ago

You're not clear

0Thank You

ANSWER

What are the conditions that should be satisfied to make two light sources coherent?

Posted by Divya Sen 7 years, 10 months ago

CBSE > Class 12 > Physics

6 answers

Pranjali Mahajan 7 years, 10 months ago

Phase difference should be 0 light should be emmiting from one source

0Thank You

Ujjawal Sharma 7 years, 10 months ago

Anything ?

0Thank You

Divya Sen 7 years, 10 months ago

I searched it now and your answer is also correct thanks.

0Thank You

Divya Sen 7 years, 10 months ago

One more point can be added which is -They must emit waves continuosly with same wavelength.

0Thank You

Divya Sen 7 years, 10 months ago

Ok thanks

0Thank You

Ujjawal Sharma 7 years, 10 months ago

Sharply defined phase difference which remains constant with time

0Thank You

ANSWER

Wavefront shape when point source is placed at focus of a convex lens? Pls elaborate (Provided it is spherical according to marking scheme but teachers deducted marks for writing spherical wavefront)

Posted by Rashi Bari 7 years, 10 months ago

CBSE > Class 12 > Physics

6 answers

Ujjawal Sharma 7 years, 10 months ago

You're welcome

0Thank You

Rashi Bari 7 years, 10 months ago

Maybe error in marking scheme. Thank you

0Thank You

Rashi Bari 7 years, 10 months ago

What is it spherical or plane?

0Thank You

Rashi Bari 7 years, 10 months ago

0Thank You

Ujjawal Sharma 7 years, 10 months ago

Since it is at focus, parallel rays will emerge. Shouldn't it be planar wavefront then?

1Thank You

Ujjawal Sharma 7 years, 10 months ago

How many marks question was it?

1Thank You

ANSWER

What is the shape of wave front when light is diverging from a point source??

Posted by Divya Sen 7 years, 10 months ago

CBSE > Class 12 > Physics

5 answers

Harsh Singh Thakur 7 years, 10 months ago

What...

0Thank You

Divya Sen 7 years, 10 months ago

Oo that's my pleasure?

1Thank You

Ujjawal Sharma 7 years, 10 months ago

Anything for you

1Thank You

Divya Sen 7 years, 10 months ago

Thanks.

3Thank You

Ujjawal Sharma 7 years, 10 months ago

Spherical wavefront

0Thank You

ANSWER

What is binding energy of nucleus??

Posted by Vaishnavi Chauhan 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Harsh Singh Thakur 7 years, 10 months ago

Or defination

0Thank You

Ujjawal Sharma 7 years, 10 months ago

Are you asking its value or meaning?

0Thank You

ANSWER

Find the condtition under which the charged partical moving with different speed in the presence of electric and magnetic field vector can be used to select charged partical of a particular speed ?

Posted by Mansi Soni 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Chhavi Verma 7 years, 10 months ago

qE=Bqv and the direction of magnetic and electric force must be opposite

1Thank You

ANSWER

How to solve numerical

Posted by Mansi Soni 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Ankit Chauhan Rajput 7 years, 10 months ago

Hands se

2Thank You

Aditi Kasaudhan 7 years, 10 months ago

Concept dkh k solve kro

1Thank You

ANSWER

Difference between interference and diffraction

Posted by Sadiq Khan 4 years, 6 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 4 years, 6 months ago

Key Differences Between Diffraction and Interference

Diffraction is the result of light propagation from distinct part of the same wavefront. While interference is the result of the interaction of light coming from two separate wavefronts.
The width of the fringes in case of diffraction is not equal while the fringe width in case of interference is equal.
Diffraction possesses poor contrast between maxima and minima while interference exhibits good contrast between maxima and minima.
For diffraction to take place slit or obstacle is necessarily required but for wave interference there exists no such requirement.
Due to diffraction, the direction of propagation of wave gets changed. Whereas in case of interference the superposed wave travels in the same direction.
In diffraction the spacing between different fringes is non-uniform. However, in the case of interference, the spacing between the fringes exhibits uniform nature.
The minimum intensity points in the case of diffraction are not completely dark. As against in case of interference, the points of minimum intensity shows complete darkness.

0Thank You

ANSWER

Rest mass of photon

Posted by Bhumi Jain 7 years, 10 months ago

CBSE > Class 12 > Physics

12 answers

Chhavi Verma 7 years, 10 months ago

Zero

0Thank You

Bhumi Jain 7 years, 10 months ago

Plzz give my questions ans I have many pending

1Thank You

Bhumi Jain 7 years, 10 months ago

OMG Ujjwal u r back...

1Thank You

Ujjawal Sharma 7 years, 10 months ago

Do ask some questions

0Thank You

Ujjawal Sharma 7 years, 10 months ago

Thanks

0Thank You

Divya Sen 7 years, 10 months ago

Oo its really andbtruly nice to have you back ujjawal now i have the person who will give correct answers?

1Thank You

Ujjawal Sharma 7 years, 10 months ago

I too was about to answer

1Thank You

Bhumi Jain 7 years, 10 months ago

Okkk...

1Thank You

Tannu Pal 7 years, 10 months ago

Always help others

0Thank You

Bhumi Jain 7 years, 10 months ago

Thnxx Tannu

1Thank You

Tannu Pal 7 years, 10 months ago

It's zero because photon has no mass it is always massless account.to special relativity

0Thank You

Tannu Pal 7 years, 10 months ago

Zero

2Thank You

ANSWER

What is paramagnetic

Posted by Ambrish Shrivastava 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Chinmay Nanda 7 years, 10 months ago

paramagnetic substances are those which are feebly magnetises towards the magnetic field.

0Thank You

ANSWER

Paramagnetic

Posted by Ambrish Shrivastava 7 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How can i download solution of sample paper 2018 phy.

Posted by Kuldeep Chaudhary 7 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Determine the value of de Broglie wavelength associated electrons orbiting in the ground state of h atom. How will the de Broglie wavelength change when it is in the first excited state?

Posted by Jeenat Parveen 7 years, 10 months ago

CBSE > Class 12 > Physics

1 answers

Chhavi Verma 7 years, 10 months ago

Use mvr=nh/2π and put value value of r by using Bohr theoru

1Thank You

ANSWER

Explain the mechanism of conduction in each type of extrinsic semiconductor

Posted by Anjali Tripathi 7 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How to understand questions

Posted by Rajeev Mirjha 7 years, 10 months ago

CBSE > Class 12 > Physics

2 answers

Prachi K 7 years, 10 months ago

Its very helpful asim khan ...my teacher teach the same method

0Thank You

Asim Khan 7 years, 10 months ago

Hey! Before giving the answer to your asked question I want to appreciate your question bcz it was the same problem with me also when I just came in class 11 and I think that many others may have the same. But now I don't find any problem regarding this. You might be thinking...How??? It's very easy. First of all be relax minded while attempting the questions. Read the given question atleast two times along with underlining the main data/information given into the question. Then create the picture of the asked query in your mind.Now how fast you are able to mug up or create the picture depends on the level of your preparation.The next step is to start doing the solution in the answer sheet. Now don't just start solving the question directly, I would advise you to write the given data into the question again in your answer sheet so that you could get the exact idea about the asked question. So in this way you may improve your weakness towards getting the question quickly. Actually I followed the same and now I don't have such problems. Hope it helps!!! Best wishes...

5Thank You

ANSWER

A narrow beam of unpolarizesd light of intensity i note incident on a polaroid p1 . The light transmitted by it is then incident on a second polaroid p2 with it pass axis making angle 60 degree relative to the pass axis of p1 . Find the intensity of the light transmitted by p2

Posted by Sandeep Yadav 7 years, 10 months ago

CBSE > Class 12 > Physics