d- B Toothed wheel Mirror Figure 34.2 Fizeau's method for measuring the speed of light using a rotating toothed wheel. The light source is considered to be at the location of the wheel; there- fore, the distance d is known.

d- B Toothed wheel Mirror Figure 34.2 Fizeau's method for measuring the speed of light using a rotating toothed wheel. The light source is considered to be at the location of the wheel; there- fore, the distance d is known.

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter9: Optics

Section: Chapter Questions

Problem 27Q

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Question

In an experiment to measure the speed of light using the apparatus of Armand H. L. Fizeau (as shown), the distance between light source and mirror was 11.45 km and the wheel had 720 notches. The experimentally determined value of c was 2.998 × 10⁸ m/s when the outgoing light passed through one notch and then returned through the next notch. Calculate the minimum angular speed of the wheel for this experiment.

d-
B
Toothed
wheel
Mirror
Figure 34.2 Fizeau's method for
measuring the speed of light using
a rotating toothed wheel. The
light source is considered to be at
the location of the wheel; there-
fore, the distance d is known.

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