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

To set particular potential diff. between anode and cathode so as to determine stopping potential and its relation with intensity and frequency.. Hope this may help you....

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How is ur preparation going on guys

Posted by Vinay Gautam 6 years ago

CBSE > Class 12 > Physics

5 answers

Vinay Gautam 6 years ago

???????

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Mitali Jain 6 years ago

Thik hi h ??

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Sourav Jha 6 years ago

Well

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Riya Rana 6 years ago

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Riya Rana 6 years ago

Good

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What is charge on á particle

Posted by Mitali Jain 6 years ago

CBSE > Class 12 > Physics

2 answers

Muskaan Vig 6 years ago

2e is charge on alpha particle....

2Thank You

Raajshekhar Rajan 6 years ago

Change is that physical property of matter that enables it to experience force when placed in electromagnetic field.

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What is mass of á particle

Posted by Mitali Jain 6 years ago

CBSE > Class 12 > Physics

1 answers

Prafull Jha 6 years ago

Mass is the property of matter responsible for gravitational force and inertia

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What is charge on deuteron

Posted by Mitali Jain 6 years ago

CBSE > Class 12 > Physics

2 answers

Rajat Barwar 6 years ago

Zero. No. of proton and neutron are equal.

1Thank You

Muskaan Vig 6 years ago

+1e is charge on deuteron

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What is the mass of deuteron

Posted by Mitali Jain 6 years ago

CBSE > Class 12 > Physics

1 answers

Raajshekhar Rajan 6 years ago

2 amu

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Derivation of expression for resultant intensity at point when displacement due to two waves y1= a cos wt and y2= a cos( wt + phie ) frm two coherent sources superpose at a point

Posted by Vaishnavi Kesharwani 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

Electric field at equotorial point of a dipole is directed_______ to the dipole moment.

Posted by Nandini Sharma 6 years ago

CBSE > Class 12 > Physics

3 answers

Chandani Ranpura 6 years ago

Opposite or anti parallel

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Chandra Kant Singh 6 years ago

Perpendicular

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Vishwa Jeeth 6 years ago

Opposite

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ANSWER

Laws and derivation of electrostatic

Posted by Muskan Singh 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

What is your preparation for april jee mains?? Give breif description...

Posted by Shubham Kumar Gupta 6 years ago

CBSE > Class 12 > Physics

1 answers

Ritik Kumar 6 years ago

kha krega padke

1Thank You

ANSWER

A ray of light is incident on the face AB of an isosceles triangular prism makes an angle of incidence (i) and deviates by angle Beeta as shown in figure. Shows that in the position of minimum deviation angle beeta equals to angle alpha. Also find out the condition when the refracted ray suffers total internal reflection.

Posted by Sachin Kumar 6 years ago

CBSE > Class 12 > Physics

2 answers

Riya Rana 6 years ago

Ray will suffer total internal reflection when i>ic.

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Riya Rana 6 years ago

As shown in THE FIGURE ??!!!

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Which are most important derivation for physics cbse class 12..pls advice

Posted by Harsh Raghuwanshi 6 years ago

CBSE > Class 12 > Physics

2 answers

Nikita Beniwal 6 years ago

Go through the PDF of aman dattarwal

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Muskan Verma 6 years ago

Electrostatics -Main application of gauss law Columbs law in vector form Torque on electric dipole Electric fiel due to electric dipole at axial/equatorial point

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Can two equipotential surfaces intersect each other. Give reason.

Posted by Priya Shyam 6 years ago

CBSE > Class 12 > Physics

2 answers

Riya Rana 6 years ago

No they cannot bcoz if they did then they will have to have same potential at that point of intersection which is not possible.

1Thank You

Gaurav Seth 6 years ago

No they cannot intersect each other because two different equipotential surface have different electric potential, so if they intersect then the point of intersection will have two different potentials at the same point which is not possible.

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Dielectric constant of water is 80. What is its permeability?

Posted by Priya Shyam 6 years ago

CBSE > Class 12 > Physics

2 answers

Riya Rana 6 years ago

What shatayu has find is permittivity not permeability.

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Shatayu Ganvir 6 years ago

708 × 10^-12

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ANSWER

A free floating magnetic needle at north pole is _____________ to the surface of earth.

Posted by Priya Shyam 6 years ago

CBSE > Class 12 > Physics

2 answers

Riya Rana 6 years ago

Verticle

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Ritwik Choudhary 6 years ago

Perpendicular

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ANSWER

Mark distribution?

Posted by Deepshikha Swain 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

How does the resolving power of a microscope depend on (i) the wavelength of the light (ii) the medium used between the object and the objective lens?

Posted by Sohan .G 6 years ago

CBSE > Class 12 > Physics

2 answers

Riya Rana 6 years ago

Resolving power= 2×u×sin×theta/lambda so, 1.it inversely depends on wavelength and 2. Directly on u (refractive index).

1Thank You

Killer Xmarty 6 years ago

Khud dhoond lo????

1Thank You

ANSWER

How is led fabricated

Posted by Sohan .G 6 years ago

CBSE > Class 12 > Physics

0 answers

ANSWER

If the angular speed of the armature of a dynamo is doubled then the amplitude of the induced emf will become_______.

Posted by Nancy Bagoria 6 years ago

CBSE > Class 12 > Physics

1 answers

Uday Mann 6 years ago

Double . Directly Proportional .

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ANSWER

Zener diode is used in reverse bias. When it's reverse bias is increased, how does the thickness of the depletion layer changes

Posted by Nancy Bagoria 6 years ago

CBSE > Class 12 > Physics

4 answers

Prashant Singh 6 years ago

Reverse bias support potential barriers .due to the potential barriers and width of the deletion layer increase

2Thank You

Riya Rana 6 years ago

Increases

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▪▪Amrit▪▪ ❤ 6 years ago

Increases but not as much in normal pn junction in revese bias coz.it is highly doprd ..

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Uday Mann 6 years ago

Kincreases

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ANSWER

Which physical quantity in a nuclear reaction is considered equivalent to the Q value of the reaction

Posted by Nancy Bagoria 6 years ago

CBSE > Class 12 > Physics

1 answers

Uday Mann 6 years ago

Kinetic energy

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ANSWER

A conducting shell has a charge of +10e at its surface.A charge of -20e is given at the centre of the shell. What is the net charge on the outer surface of the shell

Posted by Dinesh Kumar 6 years ago

CBSE > Class 12 > Physics

2 answers

Prashant Singh 6 years ago

Yes 10e hoga kyu ki conductor ke aandra charge zero hota h uske charge surface pe lie karte h.

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Uday Mann 6 years ago

+10e . Additive nature . Yeh ni aaega Gauss Law padh le bhai vo aaega .

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Define Biot Savart's lae

Posted by Samir Sheikh 6 years ago

CBSE > Class 12 > Physics

2 answers

Prashant Singh 6 years ago

Boit savart law is an experimental law which deals with current carrying conductors due to small currents elements.

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Uday Mann 6 years ago

Mf . At a pt P due to curent carrying element dl carrying current I at a distance of r from element is given as : formal

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Bohr's third postulate

Posted by Ankit Dhawan 6 years ago

CBSE > Class 12 > Physics

2 answers

Riya Rana 6 years ago

Bohr's third postulate states that when an electron shifts from one orbit to another, energy is released which is equivalent to the difference in the energy of the two orbits. E2 -E1=hv.

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Uday Mann 6 years ago

Emission aur absorption of energy only when electron moves from one of its specified non radiating (stationary orbit) to another .

1Thank You

ANSWER

Quantisation of charge

Posted by Akash Chaurasiya Ac 6 years ago

CBSE > Class 12 > Physics

1 answers

Iamalokm_ /Jac 6 years ago

The total charge present in a body is of integral multiple of one electronic charge ... Q=+-ne

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ANSWER

Is ac generator is in syllabus

Posted by Tevar Jaat 6 years ago

CBSE > Class 12 > Physics

4 answers

Uday Mann 6 years ago

Yeep . 5 no. Ka question aaega uspr se pakka

1Thank You

Ankit Singh 6 years ago

Yeap

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Nikita Beniwal 6 years ago

And it is important

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Shalini Singh 6 years ago

Yes

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'Two independent monochromatic sources of light cannot produce a sustained interference pattern '.Give reason.

Posted by Muskaan Vig 6 years ago

CBSE > Class 12 > Physics

4 answers

Shefu ??????? 6 years ago

because they have different distribution of energy in all directions and have different phase difference therefore can't superimpose and act as incoherent sources so two monochromatic sources of light cannot produce sustained intereference

2Thank You

Riya Rana 6 years ago

The difference in the phase difference will not be same.

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Nikita Beniwal 6 years ago

That is they are incoherent

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Nikita Beniwal 6 years ago

They don't have constant phase difference

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ANSWER

2017 questions paper solution