What is the use or importance of the ozone layer?

  • A
    It prevents ultraviolet radiation from reaching the Earth.
  • B
    It reduces the greenhouse effect.
  • C
    It reflects radio waves.
  • D
    It controls the $O_2/H_2$ ratio.

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The electromagnetic waves of frequency $2 \ MHz$ to $30 \ MHz$ are used in:

Give the range of wavelength of visible light.

The correct order of electromagnetic waves with increasing frequency is

The frequency range from $3\, MHz$ to $30\, MHz$ is known as:

In which one of the following regions of the electromagnetic spectrum will the vibrational motion of molecules give rise to absorption?

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