Physics
The spring constant of a spring depends on its

Length and its diameter
Thickness, its diameter and its material
Length only
Material only

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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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