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Which of the following option is true if hills and valleys on any surface are very close?

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Which of the following option is true if hills and valleys on any surface are very close?

(a) Wavelength is more

(b) Wavelength is small

(c) Surface appears more wavy

(d) Surface appears rough but wavelength is more

I got this question at a job interview.

This key question is from Meaning of Surface Texture in division Measurement of Surface Finish of Engineering Metrology

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The correct answer is (b) Wavelength is small

The best I can explain: If the hills and valleys are close to each other on any surface then the wavelength is very small and the surface appears rough and if they are far apart then the wavelength is more and appears more wavy.

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