Physics
Which of the following is arranged in order of decreasing conductivity?

Copper, Aluminium, Steel, Silver
Aluminium, Silver, Copper, Steel
Silver, Copper, Aluminium, Steel
Copper, Silver, Aluminium, Steel

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Physics
A standing wave occurs when

The speed of the wave is zero or near zero
The amplitude of a wave exceeds its wavelength
Two waves overlap
A wave reflects upon itself

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