Physics
Which one of the following is not a property of electromagnetic waves?

Electromagnetic waves do not require a medium to propagate.
Electromagnetic waves are transverse waves
Oscillating electric field and magnetic field are perpendicular to each other.
Electromagnetic waves do not show interference and diffraction.

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Physics
Isotopes of an element contain

equal number of protons and electrons
the same number of protons but different number of neutrons
equal number of nucleons
the same number of neutrons but different number of protons

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