Orange light of wavelength 0.61 µ m in air enters a block of glass with εr = 1.44. What color would it appear to a sensor embedded in the glass? The wavelength ranges of colors are violet (0.39 to 0.45 µ m), blue (0.45 to 0.49 µ m), green (0.49 to 0.58 µ m), yellow (0.58 to 0.60 µ m), orange (0.60 to 0.62 µ m), and red (0.62 to 0.78 µ m)

Explanation:

= Actual wavelength =

= Relative permittivity = 1.44

The observed wavelength in the glass is given by

The wavelength lies in the range of green light.

Hence, the observed color of light is

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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answer: electrons