Wavespeed = frequency x wavelength
= 14 x 9
= 126 mm/s
= 0.126 m/s
B. Both of these types of lenses have the ability to produce real images.
B.) 100 N is the CORRECT answer
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U need an insulator to prevent the shock passing through , that's why there is a plastic sheet covering the copper wires so that it can prevent the electricity passing through as plastic is an insulator and does not conduct electricity