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

As wavelength of light decreases the velocity of light in decreases NowAbsolute refractive index of the medium is equal to the speed of light in air / speed vof light in medium .therefore if the velocity of light changes the refractive index of the medium also changes

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The image of an object formed by a lens on the screen is not in sharp focus . suggest a method to get clear focusing of the image on the screen without disturbing the position of the object the lens or the screen

Posted by Neha Patidar 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

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Derivation of galvanometer

Posted by Shubham Shukla 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Vikas Choudhary 6 years, 4 months ago

I know this

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How to study physics for boards ?

Posted by Saheb Ok 6 years, 4 months ago

CBSE > Class 12 > Physics

5 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 3 months ago

bhai tension free ho kar padh... Sirf ncert aur SL kar le.

2Thank You

Abhay Vaishnav 6 years, 3 months ago

For getting good marks mtg champion is the best reference book

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Saheb Ok 6 years, 4 months ago

Thanks bhai

1Thank You

Boss Boss 6 years, 4 months ago

Best book is Arihant chapterwise and Ncert

2Thank You

Boss Boss 6 years, 4 months ago

Physics is the subject of understanding. Physics can be done by feel it

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The photoelectric threshold for a metal is 3000A°.find the kinetic energy of an electron ejected from it by radiation of wavelength 1200A°.

Posted by Rani Kumari 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

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How can we prepare numerical for the 12 class physics

Posted by Preeti Sahu 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Vikas Semwal 6 years, 4 months ago

Numericals m focus mt kro jyada.... Theory majboot kro...... Kyonki board m max questions theory se related hoke hi numericals aenge..... Agar theory pta h to questions attempt honge

3Thank You

Khushi Singh 6 years, 4 months ago

Do only ncert problems

1Thank You

Preeti Sahu 6 years, 4 months ago

Only SL arora is inof for numerical

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Newton third law of motion

Posted by Bhupesh Bhardwaj 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Nitesh Dureja 6 years, 4 months ago

Every action has an equal and opposite reaction

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A spherical convex surface of radius of curvature 20cm,made of glass (n=1.5) is placed in air.find the position of the image formed if a point object is placed at 30cm in front of the convex surface on the principal axis.

Posted by Hibu Nassung 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

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What will be the de Broglie wavelength of an e having kinetic energy of 500 ev?

Posted by Dominic Maring 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

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Hlo

Posted by Jashan Deep 5 years, 10 months ago

CBSE > Class 12 > Physics

0 answers

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How is the value of acos theta equal to coswtwt?

Posted by Rajinder Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

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why welders are wearing powerful goggles?

Posted by Shubham Choubey 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

N Jangid 6 years, 4 months ago

To reduce intensity of light and incomming of unpolarised light .

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What are the 7 use of logic gates?

Posted by Mahi Tiwari 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

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What are the 6advantage (in points) of logic gates?

Posted by Mahi Tiwari 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

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What are the 6 disadvantage (in points) of logic gates?

Posted by Mahi Tiwari 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is the frequency of light

Posted by Bhawna Sikarwar 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Mahi Tiwari 6 years, 4 months ago

The frequency is the no. Of waves that pass a point in space during any time interested, usually one second. We measure it in units of cycle (waves) per second or Hertz (Hz).

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What are the most important topics of 1st chapter of physics

Posted by Live To Drive 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Santy Baralu 6 years, 4 months ago

Electric field due to dipole on axial and equatorial. Electric potential. Electric field due to sheet. Capacitance

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If the peak value of an AC is 14.14V, find the r.m.s value of the AC

Posted by Dorina Kumam 6 years, 4 months ago

CBSE > Class 12 > Physics

2 answers

Santy Baralu 6 years, 4 months ago

r m s value of ac =0.707x peak value of ac

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Aditi Singh 6 years, 4 months ago

Vrms=Vo/√2 Vo=14.14V(given) Vrms=14.14/√2 Vrms=14.14/1.414 Vrms=10V

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In optical instruments...is Eye in syllabus for 2019-20 examinations????

Posted by Dãñīyã Arshãd? 6 years, 4 months ago

CBSE > Class 12 > Physics

9 answers

Řøhăň Řąjpůť ✌️✊ 6 years, 3 months ago

noo this topic is not the part of our syllabus. bacche thode hai toh 10th ke. ?

3Thank You

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

But my teachers told that this topic is removed

3Thank You

Dãñīyã Arshãd? 6 years, 4 months ago

There is still a big confusion....some are saying Yes and some are saying No..??

3Thank You

Srishti Choudhary ✍⏳ 6 years, 4 months ago

Kaha ho behno

3Thank You

Amol Gùpta 6 years, 4 months ago

Nhi h how ????

2Thank You

꧁≪Mämƭå ℭℏ۝ᑌĎℎàℜÿ? 6 years, 4 months ago

3Thank You

Jayanti K 6 years, 4 months ago

1Thank You

Gaurav Kataria 6 years, 4 months ago

1Thank You

Amol Gùpta 6 years, 4 months ago

Yess it is

2Thank You

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Define ghost theorem

Posted by Arman Malik 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

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Tesla coil pe physics ka model bna sakte h

Posted by Shivani Sharma 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Tanmay Chaudhary 6 years, 4 months ago

Why not

1Thank You

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Deduce de broglie wavelength of electron

Posted by Vishal Singh 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Neha Choudhary 6 years, 4 months ago

Vd =hc/lemda

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a thin converging lens of RI 1.5 act as concave of focal length 50 cm when emerged in liquid of RI 15/8. Calculate focal length of converging lens in air.

Posted by Shreya Ks 6 years, 4 months ago

CBSE > Class 12 > Physics

0 answers

ANSWER

The force between two electric dipoles, seperated by distance r, is proportional to :

Posted by Aj King Mahakaal 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Sia ? 6 years, 4 months ago

<div class="ans_text">The force between two short electric dipoles separated by a distance r is directly proportional to 1/r³ .
As we know that , electric field due to the dipole = 2kp/r³
and force F=qE
so we can write that , F is proportional to the 1/r³ .</div>

1Thank You

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How can u say that lens is diverging or converging neglecting focus

Posted by Himanshu Srivastava 6 years, 4 months ago

CBSE > Class 12 > Physics

3 answers

Tanmay Chaudhary 6 years, 4 months ago

But the behaviour of lenses will changed when refractive index of surrounding is more than that of lens

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Tanmay Chaudhary 6 years, 4 months ago

And it is the case when refractive index of lens is more than refractive index of surrounding

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Tanmay Chaudhary 6 years, 4 months ago

If a lens is wide from centre and thin from edges then it is converging whereas if it is wide from edges and thin from centre then it is diverging lens

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Is it true that cbse has updated that 2020 exam will not be ncert based and only according to syllabus??? So which book should we prefer if not ncert???

Posted by Aradhya Trivedi 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Satyender Rai 6 years, 4 months ago

No there is no such circular officially send to cbse schools

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How to solve numerical in phy

Posted by Jayanti K 6 years, 4 months ago

CBSE > Class 12 > Physics

1 answers

Satyender Rai 6 years, 4 months ago

1. Understand concept 2. Learn formulas 3.Practice one of the toughest numerical based on this concept. 4. If no success,then again go to the concept and try new tough example of ncert and tally your answer. 5. Finally try to solve previous average question u will find it very easy and your confidence will boast.

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How to numerical prbs in physics....tell me

Posted by Jayanti K 6 years, 4 months ago

CBSE > Class 12 > Physics