Important Electromagnetic Waves Formulas for JEE and NEET

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c
U
p ? 
energy transferred to a surface in time t is U, the magnitude of
the total momentum delivered to this surface (for complete
absorption) is p
Electromagnetic spectrum
Type Wavelength 
range 
Production Detection 
Radio > 0.1m Rapid acceleration and 
decelerations of electrons in 
aerials 
Receiver's aerials 
Microwave 0.1m to 1mm Klystron value or magnetron 
value 
Point contact diodes 
Infra-red 1mm to 700nm Vibration of atoms and 
molecules 
Thermopiles Bolometer, 
Infrared photographic 
film 
Light 700nm to 
400nm 
Electrons in atoms emit light 
when they move from one 
energy level to a lower 
energy 
The eye, photocells, 
Photographic film 
Ultraviolet 400nm to 1nm Inner shell electrons in 
atoms moving from one 
energy level to a lower level 
photocells photographic 
film 
X-rays 1nm to 10
–3
 nm X-ray tubes or inner shell 
electrons 
Photograpic film, Geiger 
tubes, lonisation chamber 
Gamma 
rays 
< 10
–3
nm Radioactive decay of the 
nucleus 
do