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Characteristics Of Em Waves Free Doubts and Solutions

CBSE - XII Science - Physics - Electromagnetic Waves

Why light can travel in vacuum where as sound can not do so

Asked by dumpapurush 22nd October 2018, 10:48 AM
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CBSE - XII Science - Physics - Electromagnetic Waves

What is polarisation

Asked by ashwin.mts 1st October 2018, 5:27 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

how are frequency and intencity of electromagnetic wave related?

Asked by mbinukurian1971 25th July 2018, 12:29 AM
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CBSE - XII Science - Physics - Electromagnetic Waves

Why a wave needs a medium to propagate? If so then why light does not need any medium? And why wave travel better in denser medium... and if so then why not light ?

Asked by m_tauqeer_ 15th February 2018, 12:11 AM
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CBSE - XII Science - Physics - Electromagnetic Waves

Please Prove the fact that intensity is directly proportional to amplitude of the wave...

Asked by nitishkrnehu09 9th October 2017, 6:56 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

A capacitor made of 2 parallel Plate area A and separation D being Charged by Ac Show that the displacement current inside capacitor is same as the current charging the capacitor
 

Asked by Anshul 8th September 2017, 6:28 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

Electromagnetic waves are transversal in nature? Please provide me the mathamatical derivation
with most simple method
 

Asked by Anshul 8th September 2017, 6:25 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

Show that the average energy density of EMW is constant

Asked by rajuharan 12th March 2017, 7:43 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

Find the intensity of EMW wave?

Asked by rajuharan 12th March 2017, 7:40 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

diffenrence between ultraviolet and infrared wave 
did i say that they both are same because are light afterall soo why they are diffrent 

Asked by saggugurupal 31st August 2016, 3:50 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

Plz explain what experiment did sir Marconi did with Hertz experiment how he set up apparatus ?(plz explain this with diagram)and how did it worked??how were em waves generated and detected across English channel.
 

Asked by upmaniousagarika 30th July 2016, 5:56 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

What is the difference between transient current and displacement current?

Asked by joykphukan 23rd December 2015, 6:11 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

A plane electromagnetic wave, of angular frequency w is propagating with velocity c along the Z axis. Write the vector equations, of oscillating electric and magnetic fields and show these fields diagrammatically.

Asked by vinitapahel123 13th December 2015, 12:08 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

1. a capacitor has been charged by a DC source. what are the magnitudes of the conduction and displacement currents, when it is fully charged?
2. two wires of equal lenght, one copper and the other of manganin have same resistance. which is thicker?
 

Asked by ritu.nathawani 8th March 2015, 12:40 AM
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CBSE - XII Science - Physics - Electromagnetic Waves

what is the frequency range of X-rays, gamma rays, UV rays, visible light, infrared rays, microwave and radio waves???
what is mass and charge of a deutron????

Asked by Karishma 4th March 2015, 8:18 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

15. Explain how one ‘observes an inconsistency’ when Ampere’s circuital law is applied to the process of charging a capacitor and how this ‘contradiction’ gets removed by introducing the concept of an ‘additional current’, known as the ‘displacement current’?

Asked by Malavika Umesh 26th February 2015, 10:24 AM
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CBSE - XII Science - Physics - Electromagnetic Waves

Proove that EMW are transverse in nature and also find the energy density of EMW and poynting vector

Asked by Dr Amitava 15th October 2014, 7:37 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

what are the applications of various electromagnetic waves ???

Asked by Aashna Anith Kumar 20th August 2014, 9:42 AM
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CBSE - XII Science - Physics - Electromagnetic Waves

A plane electromagnetic wave travels in vacuum along z-direction. What can you say about the direction of electric and magnetic field vectors?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

The oscillating magnetic field in a plane electromagnetic wave is given by: (i) Calculate the wavelength of the electromagnetic wave. (ii) Write down the expression for the oscillating electric field.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

Write any four characteristics of electromagnetic waves. Give two uses each of (i) radio-waves (ii) Micro-waves.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

(a) An em wave is travelling in a medium with a velocity . Draw a sketch showing the propagation of the em wave, indicating the direction of the oscillating electric and magnetic fields. (b) How are the magnitudes of the electric and magnetic fields related to the velocity of the em wave?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

What are the factors on which the velocity of light in vacuum depends?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

What travels faster than electromagnetic waves?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

Calculate the time period of visible light for which the human eye is most sensitive.

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

Which scientist a. Predicted the presence of electromagnetic waves b. Experimentally demonstrated the existence of electromagnetic waves

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

What is an electromagnetic wave?

Asked by Topperlearning User 4th June 2014, 1:23 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

When an ideal capacitor is charged by dc battery, no current flows. However, when an ac source is used, the current flows continuosly. How does one explain this, based on the concept of displacement current?

Asked by Topperlearning User 19th May 2014, 3:32 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

What is meant by the transverse nature of electromagnetic waves ? Draw a diagram showing the propagation of an electromagnetic wave along X-direction indicating clearly the directions of oscillating electric and magnetic fields associate with it.

Asked by Topperlearning User 19th May 2014, 2:41 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

What is the relation between the wavelength and frequency?

Asked by Topperlearning User 19th May 2014, 1:47 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

Suppose a plane electromagnetic wave is travelling in x  direction. What is a. The direction of the electric and magnetic field vectors b. The ratio of magnitudes

Asked by Topperlearning User 19th May 2014, 1:42 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

Explain the Hertz experiment to generate the electromagnetic wave.

Asked by Topperlearning User 19th May 2014, 1:38 PM
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CBSE - XII Science - Physics - Electromagnetic Waves

State the properties of Electromagnetic Waves.

Asked by Topperlearning User 19th May 2014, 1:22 PM
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