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The physical quantity which oscillates in a wave formed by slinky is :a) massb) energyc) amplitude d) frequencyPlease answer with reasons. Thanks.



Mass oscillates in mechanical waves like pressure waves, or sound waves caused due to vibration. There is no mass oscillating in an electromagnetic wave. Amplitude is a fixed quantity for a constant wave of a frequency. The amplitude could oscillate (vary periodically) if there are multiple frequencies in a wave. Frequency can also oscillate periodically if the wave is modulated. For example, in case of FM radio waves, the frequency oscillates in the air waves. In a simple single frequency wave with a constant amplitude, the quantity that varies as a Sine or cosine is the energy in the wave at a point or the energy that is transmitted along the direction of propagation is an expression with Sine function in it. The time average of energy is a constant. So the answer is energy, which is more appropriate than other choices given.
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