Physics
The device used to convert solar energy into electricity is

Photovoltaic cell
Daniell cell
Electrochemical cell
Galvanic cell

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

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

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