EMW Flashcards
1
Q
Two uses of Infrared rays
A
Remote controls of TV
Treats skin diseases
Photography when there is no visible light
2
Q
Microwaves are used in radar. Why?
A
Due to short wavelengths, they easily penetrate into earth atmosphere
3
Q
Applications of microwave?
A
Microwave ovens to raise temp of food
Radar system for air craft navigation
4
Q
How are microwave produced?
A
By special vaccume tubes called Klystrons or Megatrons or gun diodes. They are produces by accelerating charged particles
5
Q
If wavelength is doubled then energy of photon become?
A
Half
6
Q
The charging current for capacitor is 0.6A.What is displacement current?
A
Charging current=Displacement current
