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Chapter 33: Problem 1

Why was the Michelson-Morley experiment a more sensitive test of motion through the ether than independent measurements of the speed of light in two perpendicular directions?

Short Answer

Expert verified
The Michelson-Morley experiment is more sensitive than independent measurements of the speed of light in two perpendicular directions because it employs the principle of interference, making it capable of detecting even minute differences that could potentially indicate motion through the hypothetical 'aether'.

Step by step solution

01

Understanding the Michelson-Morley Experiment

The Michelson-Morley experiment was devised to detect the presence of aether, a hypothetical medium through which light propagates. The experiment compared the speed of light in two perpendicular directions: one parallel to the motion of the Earth in its orbit (known as the aether wind), and one perpendicular to it.
02

Explanation of Interferometer

The experiment used an instrument called an interferometer. Light from a source was split into two beams travelling at right angles to each other. After reflecting off mirrors, the two beams were recombined and directed towards an observer. If there was any relative motion between the light source and the interferometer (caused by the Earth moving through the aether), there would be a change in the time taken for the light beams to traverse their respective paths, producing an interference pattern.
03

Sensitivity of Michelson-Morley Experiment

The Michelson-Morley Experiment is more sensitive because it uses the principle of interference. If there is even a minute difference in the time taken for the two beams to travel their paths, it would result in a shift in the interference pattern, making the detection of motion through the aether more precise. Independent measurements of the speed of light in two perpendicular directions, on the contrary, might not detect such minimal deviations.

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