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Which colour of the light has the longest wavelength?

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Important Questions on Electromagnetic Waves

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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-3>Q 12
A parallel plate capacitor of capacitance 20 μF is being charged by a voltage source whose potential is changing at the rate of 3 V s-1. The conduction current through the connecting wires, and the displacement current through the plates of the capacitor, would be, respectively
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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-3>Q 13
The decreasing order of the wavelength of infrared, microwaves, ultraviolet  and gamma rays is:  
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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-3>Q 15
An electromagnetic wave in vacuum has the electric and magnetic field E→ and B→, which are always perpendicular to each other. The direction of polarization is given by X→ and that of wave propagation by k→. Then
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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-3>Q 16
The magnetic field in a travelling electromagnetic wave has a peak value of 20 nT. The peak value of electric field strength is:
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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-3>Q 17
During the propagation of electromagnetic waves in a medium
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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-3>Q 18
Match List - I (Electromagnetic wave type) with List - II (Its association/application) and select the correct option from the choices given below the lists :
 
  List - I   List - II
(a) Infrared waves (i) To treat muscular strain
(b) Radio waves (ii) For broadcasting
(c) X - rays (iii) To detect fracture of bones
(d) Ultraviolet rays (iv) Absorbed by the ozone layer of the atmosphere
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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-3>Q 19
A red LED emits light at 0.1 watt uniformly around it. The amplitude of the electric field of the light at a distance of 1 m from the diode is:
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Alpha Question Bank for Medical: Physics>Chapter 29 - Electromagnetic Waves>Exercise-3>Q 20

Arrange the following electromagnetic radiations per quantum in the order of increasing energy:

A: Blue light

B: Yellow light

C: X-ray

D: Radiowave