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Grade 10Wave Optics

In an experiment to measure the speed of light by Fizeau’s apparatus, following data are used: Distance between the mirror = 12.0 km, Number of teeth in the wheel = 180. Find the minimum angular speed of the wheel for which the image is not seen.

Profile image of Hrishant Goswami
12 Years agoGrade 10
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1 Answer

Profile image of Deepak Patra
12 Years ago
Sol. In the given Fizeau’` apparatus, D = 12 km = 12 × 10^3 m n = 180 c = 3 × 10^8 m/sec We know, c = 2Dnω/π ⇒ ω = πc/2Dn rad/sec = πc/2Dn * 180/π deg/sec ⇒ ω = 180 * 3 * 10^8/24 * 10^3 * 180 = 1.25 * 14^4 deg/sec

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