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What is the frequency used for depths of 2 to 3 mm in induction hardening?

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What is the frequency used for depths of 2 to 3 mm in induction hardening?

(a) 1200 Hz

(b) 3000 Hz

(c) 5400 Hz

(d) 9600 Hz

This question was posed to me by my school principal while I was bunking the class.

This is a very interesting question from Selective Hardening in chapter Heat Treatment of Engineering Material & Metallurgy

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Right option is (d) 9600 Hz

Easiest explanation: The depth to which the heating occurs varies inversely as the square root of the frequency in case of induction hardening. This means that as higher frequencies are used, the depths achieved are shallower. The typical frequencies used are 3000 Hz for 3-6 mm depth and 9600 Hz for 2-3 mm depth.

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