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High School/JEE/NEET/IPhO Physics | 17-19 Yrs

Basic Tools

Mechanics

Heat & Thermodynamics

Oscillation & Waves

Properties of Matter

Gravitation

Electrostatics

Electric Current & Circuits

Magnetic Effects

Optics

Modern Physics

Semiconductors

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I have doubt... there are conceptual lectures and advance lectures... then why pg classes and booster classes... which i follow... what is the order to watch videos

6 years ago by Repudi Rajasekhar

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when the sell of difference emf and internal resistance are connected in parraler the current capicity decrease in comparisan with single sell how?

7 years ago by narayan kalani

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A 2-V cell is connected to a 1-Ohm resistor. How many electrons come out of the negative terminal of the cell in 2 minute.

7 years ago by Aviral Singh

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1.5*10^21 electrons apply the formula I=Q/T Q=ne where n is number of electrons and e is charge of an electron find I first by using V=IR T= 120seconds

7 years ago by ABHISHEK SHANKAR

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sir please tell....if electrons are not continuously accelerated then how a current passing through the filament of the (dc)bulb is able to emit electromagnetic radiation(light)...which is not possible widout the acceleration of chrges(electrons) ???????

10 years ago by overdozed

Ans 1 ->

electrons are accelerated due to force experienced by electric field ... but are also opposed due to collisions and also due to interaction with other neearby electrons ... while colliding they distribute some of their kinetic energy ... probably exciting an electron to some another energy level .... and hence light emitted is due to increase in energy of electrons of atoms of that conductor .... that is why you only observe excess energy on the form of light .. when collisions become significant enough like filamint in bulb.

10 years ago by yashwanth

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sir ..i wanna know dt if.. charges(electrons) are not accelerated in a conductor(appliance..like bulb)..when a dc voltage is apllied across its ends then why is dat a bulb or LED generates electromagnetic radiations.(light)...vdout accelerating the charges ??????

10 years ago by overdozed

Ans 1 ->

In LEDs and bulbs the electromagnetic radiations are produced from the jumping of electrons from a higher energy level to a lower energy level i.e. from conduction to valence band.

10 years ago by Bhavya Popli

Ans 2 ->

in bulb joules law of heating is applied by which filament(tungsten resistivity=52.3 ohm m)gets heated up and simultaneously electrons get excited.when they fall back from higher energy level to lower energy level difference in energy is emitted as light.ACCORDING TO WWEIN'S DISPLACEMENT LAW WAVELENGTH INVERSELY PROPORTIONAL TO ABSOLUTE TEMPERATURE.AS WAVELENGTH INCREASES IT MOVES FROM INFRARED REGION TO VISIBLE REGION.

9 years ago by REEMA S

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Video Lectures

High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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