A 1 mW He-Ne laser beam has a wavelength of 632.8 nm. 1) Calculate the energy E
ID: 1616913 • Letter: A
Question
A 1 mW He-Ne laser beam has a wavelength of 632.8 nm. 1) Calculate the energy E of the laser beam in electron volts (ev) 2) What color does this laser beam's wavelength correspond? 3) If this laser beam is focused into a 1 carat diamond, with the index of refraction n = 2.42, calculate the speed of the laser beam.No diagram or image attached. All that is given.
A. E = 1.96 ev, color is red, v = 1.24 x 10^8 m/s B. E = 1.6 x 10^-19 ev, color is not invisible range, v = 3 x 10^8 m/s C. E = 2.5 ev, color is green, v = 1.24 x 10^8 m/s D. E = 3.03 ev, color is violet, v = 4 x 10^8 m/s A 1 mW He-Ne laser beam has a wavelength of 632.8 nm. 1) Calculate the energy E of the laser beam in electron volts (ev) 2) What color does this laser beam's wavelength correspond? 3) If this laser beam is focused into a 1 carat diamond, with the index of refraction n = 2.42, calculate the speed of the laser beam.
No diagram or image attached. All that is given.
A. E = 1.96 ev, color is red, v = 1.24 x 10^8 m/s B. E = 1.6 x 10^-19 ev, color is not invisible range, v = 3 x 10^8 m/s C. E = 2.5 ev, color is green, v = 1.24 x 10^8 m/s D. E = 3.03 ev, color is violet, v = 4 x 10^8 m/s 1) Calculate the energy E of the laser beam in electron volts (ev) 2) What color does this laser beam's wavelength correspond? 3) If this laser beam is focused into a 1 carat diamond, with the index of refraction n = 2.42, calculate the speed of the laser beam.
No diagram or image attached. All that is given.
A. E = 1.96 ev, color is red, v = 1.24 x 10^8 m/s B. E = 1.6 x 10^-19 ev, color is not invisible range, v = 3 x 10^8 m/s C. E = 2.5 ev, color is green, v = 1.24 x 10^8 m/s D. E = 3.03 ev, color is violet, v = 4 x 10^8 m/s
Explanation / Answer
1) E = hc/lamda
E(eV) = 1243/lamda(nm)
E = 1243/632.8
E = 1.96 eV
2) lamda = 632.8 nm belongs to red color
3)n = 2.42
n = c/v
2.42= 3*10^8/v
v = 1.24*10^8 m/s
correct option is (A)
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