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

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

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Physics
Isotopes of an element contain

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

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