CBSE Class 12 science: Characteristics of EM Waves Videos | Electromagnetic Waves - Part 2

• please resolve with good explanation
  
• which of the following does not travel in vaccum
  
• what is displacement current? why this concept was introduced?
• Please answer this.  What is meant by the term 'displacement current'? Briefly explain how this current is different from a conduction current.
• Why is the intensity of light is directly proportional to the square of amiplitude  
• pls explain
  
• Why light can travel in vacuum where as sound can not do so
• What is polarisation
• how are frequency and intencity of electromagnetic wave related?
• What is an electromagnetic wave?

Queries asked on Sunday & after 7 pm from Monday to Saturday will be answered after 12 pm the next working day.