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Chapter 33: Problem 2

Why was it necessary to repeat the Michelson-Morley experiment throughout the year?

Short Answer

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The Michelson-Morley experiment was repeated throughout the year because the scientists were trying to measure the effects of the Earth鈥檚 motion around the Sun through the supposed 'ether' on the speed of light. The expectation was that the speed of light would vary with changes in the direction of Earth's motion through the 'ether'. However, the repeated experiments provided the same results every time, leading to the conclusion that the speed of light is constant.

Step by step solution

01

Understanding the Michelson-Morley Experiment

The Michelson-Morley experiment was designed to measure the speed of light in different directions and at different times. The original thinking was that if the Earth moves through the 'ether', which was believed to carry light, then the speed of light would vary according to the direction of Earth's motion and the time of year.
02

Understanding the Importance of Earth鈥檚 Orbit

Because the Earth orbits the Sun, the direction of Earth's motion changes throughout the year. Hence, it was thought that this might affect the measured speed of light.
03

The Need for Repetition

In order to validate their hypothesis about the 'ether', Michelson and Morley had to repeat their experiment at different times during the year. They were expecting to see variations in the speed of light measurements, depending on Earth's motion through the supposed 'ether'.
04

The Result of the Experiment

However, the experiment did not result in the expected outcome. No matter when they conducted the experiment, the speed of light always remained the same. This formed the basis for Einstein's Special Theory of Relativity, which postulates that the speed of light in a vacuum is a constant, irrespective of the motion of all observers.

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