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بواسطة
The wavelength of red helium-neon laser light in air is 632.8 nm.
(a) What is its frequency?
(b) What is its wavelength in glass that has an index of refraction of 1.5?
(c) What is its speed in the glass?

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بواسطة
(a) To determine the frequency of red helium-neon laser light, we can use the formula:
c = λf
where c is the speed of light in a vacuum (3.00 x 10^8 m/s), λ is the wavelength (632.8 nm or 6.328 x 10^-7 m), and f is the frequency.
Rearranging the formula to solve for frequency:
f = c / λ
f = (3.00 x 10^8 m/s) / (6.328 x 10^-7 m)
f ≈ 4.74 x 10^14 Hz
Therefore, the frequency of red helium-neon laser light is approximately 4.74 x 10^14 Hz.
(b) To determine the wavelength of red helium-neon laser light in glass, we can use the formula:
λ_glass = λ_air / n
where λ_air is the wavelength in air and n is the index of refraction of the glass (1.5).
λ_glass = (632.8 nm) / 1.5
λ_glass = 421.87 nm
Therefore, the wavelength of red helium-neon laser light in glass is approximately 421.87 nm.
(c) To determine the speed of red helium-neon laser light in glass, we can use the formula:
v = c / n
where c is the speed of light in a vacuum (3.00 x 10^8 m/s) and n is the index of refraction of the glass (1.5).
v = (3.00 x 10^8 m/s) / 1.5
v = 2.00 x 10^8 m/s
Therefore, the speed of red helium-neon laser light in glass is approximately 2.00 x 10^8 m/s.
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