According to the classification shown in the figure, which pair consists entirely of mechanical waves? 
ASound waves and light waves
BMatter waves and electromagnetic waves
CTransverse waves in a string and sound waves in air
DX-rays and radio waves
Answer & Solution
Correct answer: C. Transverse waves in a string and sound waves in air
A wave on a string and sound in air both require a material medium, so both are mechanical. Light, X-rays, and radio waves are electromagnetic, while matter waves are classified separately as non-mechanical in the figure.
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