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.)
hanji
kunal or btao
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Answer:
1.ans)Same kind of wave, so same speed.: Red light has a frequency of 4.0 X 1014-hz. rottee, this is the 7.5 X 10-7-m. v=df = (7.5x10?) (4x104) = 3x108 m/s avoco
other two answers I don't know
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1) Speed of red light in a vacuum is 30.0 × 10^7 m/s
We have been given the following:
,
We know that speed of wave = wavelength × frequency
s = ν × λ
2) Speed of red light in glass is 23.2 × 10^7 m/s
We have been given that when red light enters the glass, wavelength changes but the frequency remains the same
,
Now, s = ν × λ
3) Speed of green light in a vacuum is 30.0 × 10^7 m/s
We have been given that the frequency of green light is the same as the frequency in #1
,
Therefore, s = ν × λ
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