CBSE Class 12-science Physics Characteristics of EM Waves

• 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?
• State the properties of Electromagnetic Waves.
• Which scientist a. Predicted the presence of electromagnetic waves b. Experimentally demonstrated the existence of electromagnetic waves
• Calculate the time period of visible light for which the human eye is most sensitive.

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