1. Red light has a frequency of 4.0 x 1014 hz. Find the speed of red light in a vacuum if its wavelength is 7.5 x 10-7 m?
2. As the red light above enters a glass medium, its wavelength changes to 5.8 x 10-7 m but its frequency remains constant. What is the speed of red light in this glass?
3. Find the speed of green light if its wavelength changes to 4.2 x 10-7 m. (Please refer to question #1 for the value of the frequency of green light.)
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second one is the answer
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