Which statement correctly distinguishes a mechanical wave from a non-mechanical wave? 
AA mechanical wave can travel through vacuum, but a non-mechanical wave cannot.
BA mechanical wave requires a material medium, whereas a non-mechanical wave does not.
CA mechanical wave always has higher speed than a non-mechanical wave.
DA mechanical wave can only be transverse, whereas a non-mechanical wave can only be longitudinal.
Answer & Solution
Correct answer: B. A mechanical wave requires a material medium, whereas a non-mechanical wave does not.
Mechanical waves need a material medium for propagation because the disturbance is passed from particle to particle. Non-mechanical waves such as electromagnetic waves do not require a medium and can travel through vacuum.
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