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    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Riya Rana 5 years, 10 months ago

    It is used as telescope lenses. It has larger refractive index hence, more refration and less speed of light (in medium).

    1Thank You

    ANSWER

    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Mahi D 5 years, 10 months ago

    To make non-inductive coils, resistance coils are made of doubled up insulated wires. They are double wound so that the currents in the two wires flow in opposite directions and so create equal and opposite magnetic fields which cancel each other and so inductive effect is reduced.

    1Thank You

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    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Achyut Singh 5 years, 10 months ago

    Whats a 3d wave .?? Unable to understand. Aren't you from NASA. ?

    1Thank You

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    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 4 answers

    Tamanna Sharma 5 years, 10 months ago

    Aditya any mahi both of you tell me about energy and wavelength, but I want ans as frequency consideration not other factors

    0Thank You

    Mahi D 5 years, 10 months ago

    Maybe the reason that frequency is not changing from one medium to another is that energy of light is same in both the mediums so frequency is also unaffected...

    0Thank You

    Tamanna Sharma 5 years, 10 months ago

    You say," from one medium to another frequency never changes".why?.????

    1Thank You

    Aditya Chauhan 5 years, 10 months ago

    Although the wave slows down, its frequency remains the same, due to the fact that its wavelength is shorter. When waves travel from one medium to another the frequency never changes. As waves travel into the denser medium, they slow down and wavelength decreases.

    1Thank You

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    • Posted by Anjali Dubey 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Yogita Ingle 5 years, 10 months ago

    First Postulate:Atoms have some specific stable energy states(called stationary states) where electrons could orbit around the nucleus without emitting radiation
    Second Postulate: Orbiting of electrons occur only in the orbits (called stable orbits) where electrons’ angular momentum(L) is equal to the integral multiples ofh/(2π), leading to the quantization of moving electron
    Third Postulate: Electron while jumping from higher(initial) energy state to lower(final) energy state, emit a photon of energy equal to the energy difference between the 2 energy states, and its frequency is given by:
    hv = Ei - Ef

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    • Posted by Deepak Kumar 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 5 answers

    Tamanna Sharma 5 years, 10 months ago

    Koi to solve kar do yrr.???

    0Thank You

    Tamanna Sharma 5 years, 10 months ago

    Infinite kehne se kam nahi chalega kya tumne problem literally solve kiya,Aditya

    0Thank You

    Tamanna Sharma 5 years, 10 months ago

    Are you trying to solve it

    0Thank You

    Tamanna Sharma 5 years, 10 months ago

    I know the only answer (7) of this question as given in answer key but how, I don't know,l have no key points for image formation by 3 perpendicular mirror,only know image formation by 2 mirrors,I tried to solve it by taking 2 mirrors at 1 time but then the image overlapping case was too much and totally confused me. So, please try to solve it at once.

    1Thank You

    Aditya Chauhan 5 years, 10 months ago

    ??lrts try it i think infinite

    2Thank You

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    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Rain Drop 5 years, 10 months ago

    The reason that only transverse waves can be polarised is that their vibrations can potentially occur in all directions perpendicular to the direction of travel. It is therefore possible to confine the vibrations to a single plane.

    0Thank You

    Shruti Gupta 5 years, 10 months ago

    Bcz longtitudnal waves are already polarised

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    • Posted by Medha Bhatt 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Tamanna Sharma 5 years, 10 months ago

    This is simply based on the PI principle, its a setup of transmitting pulse (small magnetic field) and detection of these pulse. If any metallic object is placed in this it create a field in opposite direction and detecter can detect the metallic object

    2Thank You

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    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Mahi D 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Mahi D 5 years, 10 months ago

    But in question it is given to prove this using bohr 's theory.. please answer using it in derivation..

    0Thank You

    Tamanna Sharma 5 years, 10 months ago

    As electrons revolve around the nucleus and behaves like a electron loop and the current flows in opposite direction to the electron ,hence the upper and lower faces of electron loop behaves as poles of magnet and have a definite dipole moment .Hence atoms behave like a magnetic dipole.

    2Thank You

    ANSWER

    • Posted by Abhishek Kishan 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Medha Bhatt 5 years, 10 months ago

    Force experienced by the charge qnot will be equal to 4.32*10^-9 N

    0Thank You

    Tamanna Sharma 5 years, 10 months ago

    61N

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    • Posted by Sabu Joseph 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 3 answers

    Tamanna Sharma 5 years, 10 months ago

    Medha it's inverse square law ,distance becomes half the force becomes 4times

    1Thank You

    Medha Bhatt 5 years, 10 months ago

    The force becomes 1/4th of the original force

    1Thank You

    Tamanna Sharma 5 years, 10 months ago

    So simple, the force becomes 4 times

    1Thank You

    ANSWER

    • Posted by Krish Batoye 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 3 answers

    Sudhanshu Shekhar 5 years, 10 months ago

    Torque=0 ,since angle between magnetic dilole and magnetic field vector zero so costheta 0

    0Thank You

    Mahi D 5 years, 10 months ago

    Torque is MAXIMUM. Because angle b/w normal to plane of coil and magnetic field is 90°

    1Thank You

    Arti Yadav 5 years, 10 months ago

    Loop is....

    0Thank You

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    • Posted by Abhisektiwary 3676 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Tamanna Sharma 5 years, 10 months ago

    It's an adavnce discription of newly experimental theories. 1. Dual nature 2. Atoms and nuclei 3. Electronic devices 4. Communication systems ( not in syllabus but some concepts directly used in EM waves so it's better to go through this chapter at least once. ) I hope this will help you 1??

    1Thank You

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    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Achyut Singh 5 years, 10 months ago

    The function of resistance is to emitt energy in the form of heat.

    1Thank You

    Yogita Ingle 5 years, 10 months ago

    A capacitor stores electrons as static charge, an inductor as a magnetic field.
    A resistor is a plain passive device.

    If you think of electricity as water, a capacitor is like a rubber membrane across a pipe, an inductor is like an axial turbine (water makes it spin, it continues to spin and pump water a while after the flow has stopped), resistor is just like a pipe whose dimensions determine the rate of water flow.

    2Thank You

    ANSWER

    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Yogita Ingle 5 years, 10 months ago

    For jointing two metallic joints through welding process, high temperature is required. The temperature is proprtional to the square of the current through the circuit.

    The higher the current, the higher the temperature.

    When the secondary of the transformer has less number of turns in comparison to the number of turns in the primary, it is called a step down transformer.

    The secondary voltage of step down transformer is less than the primary and the current of the secondary is more than the primary current. Principally, the power of the primary and secondary is equal.

    This larger secondary current is very useful in welding process. That is why step down transformer is used for welding

    1Thank You

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    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Aditya Chauhan 5 years, 10 months ago

    In a speedometer, a magnet rotates according to the speed of the vehicle. The magnet rotates inside an aluminium cylinder (drum) which is held in position with the help of hair springs. Eddy currents are produced in the drum due to the rotation of the magnet and it opposes the motion of the rotating magne

    2Thank You

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    • Posted by Becky Shoshannah 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Shruti Gupta 5 years, 10 months ago

    Kv yet not posted their seperate sample papers

    0Thank You

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    • Posted by Tushar Jaihal 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Nitish Singh 5 years, 10 months ago

    Yes

    0Thank You

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    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 5 answers

    Abhishek Sah 5 years, 10 months ago

    AC is more dangerous than DC , As both gives electric shock but AC have attractive force but DC have repulsive force.so,..

    2Thank You

    Aditya Chauhan 5 years, 10 months ago

    Your welcome

    2Thank You

    Tamanna Sharma 5 years, 10 months ago

    Thanks both of you for this amazing explation

    3Thank You

    Aditya Chauhan 5 years, 10 months ago

    Both you can touch it and then i will also come to know sorry just kidding ... ..... ................Right answer is One of the reasons that AC might be considered more dangerous is that it arguably has more ways of getting into your body. Since the voltage alternates, it can cause current to enter and exit your body even without a closed loop, since your body (and what ground it's attached to) has capacitance. DC cannot do that.

    3Thank You

    Arpit Pathak 5 years, 10 months ago

    Hey tamanna ! According to Charles Dalziel experiments on men and women, muscles contraction is continuous in case of an electric shock with DC current. Whereas in the case of AC current, a person experiencing electric shock undergoes a series of muscle contraction. Series of muscle contraction causes very severe damage to the muscles. Due to the capacitive behaviour of the skin coming in contact with the current carrying conductor, more current can pass through the body if the voltage is rapidly changing. Studies have shown that twofold of increase in the voltage increases sevenfold increase in the current. DC current “let-go” threshold is higher than the AC “let-go” threshold. More DC current is required to produce a similar effect as of AC current.

    2Thank You

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    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Aditya Chauhan 5 years, 10 months ago

    ??Scientists have long known that the speed of light can be slowed slightly as it travels through materials such as water or glass. However, it has generally been thought impossible for particles of light, known as photons, to be slowed as they travel through free space, unimpeded by interactions with any materials.

    3Thank You

    ANSWER

    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Aditya Chauhan 5 years, 10 months ago

    I dont know much about it but .... Positrons are emitted in the positive beta decay of proton-rich (neutron-deficient) radioactive nuclei and are formed in pair production, in which the energy of a gamma ray in the field of a nucleus is converted into an electron-positron pair

    1Thank You

    ANSWER

    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 3 answers

    Tamanna Sharma 5 years, 10 months ago

    Thnks for suggestion??, I leave this topic for tomorrow ???

    2Thank You

    Aditya Chauhan 5 years, 10 months ago

    Its better to try Tommorow Sometime brain Hangs i know you are a brilliant student...

    3Thank You

    Aditya Chauhan 5 years, 10 months ago

    I have pdfs if you want i can whtsapp / email you

    3Thank You

    ANSWER

    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Aditya Chauhan 5 years, 10 months ago

    I didnt study this as i am in class 11 doing preperation with class 12 if you get this anwr notify me also by the wat my board is next year

    1Thank You

    Aditya Chauhan 5 years, 10 months ago

    I think you are Jee aspirant..

    1Thank You

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    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Aditya Chauhan 5 years, 10 months ago

    Good quetiin?I also want this answr

    2Thank You

    ANSWER

    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Ritika Kumar 5 years, 10 months ago

    Temperature increases the conductivity

    1Thank You

    ANSWER

    • Posted by Tamanna Sharma 5 years, 10 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

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