Electromagnetic Waves

Choose the correct answer from the alternatives given.
A radio can tune to any station in 7.5 MHz to 12 MHz band. The corresponding wavelength band is
For an opaque body coefficient of transmission is:
Which of the following types of waves travels at the greatest speed through the vacuum?
Which of the following doesnt represent Maxwells equation?
Infrared radiation was discovered in $$1800$$ by.