Yellow light always has a lower frequency than green light. (a) In a vacuum, the

Question

Yellow light always has a lower frequency than green light. (a) In a vacuum, these two colors are known to travel at the same speed. How do their wavelengths compare in vacuum? Choose one answer only. wavelength of green > wavelength of yellow wavelength of yellow > wavelength of green wavelength of yellow = wavelength of green (b) In a certain type of glass, these colors are known to have the same wavelength. How do their wave speeds compare in this glass? Choose one answer only. average speed of yellow > average speed of green average speed of green > average speed of yellow average speed of yellow = average speed of green

Explanation / Answer

for EM waves

V = f *lambda

f = frequency of wave

lambda = wavelenth

V = speed

so

a)

speed is same more frequency means less lambda means

wavelength of yellow > wavelength of green

b) if same wavelength

more velocity for more frequency so

average speed of green > average speed of yellow

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