Step-by-step explanation:
We have,
The wavelength of yellow light, 
Frequency of yellow light, 
It is assumed to find the speed of light in the yellow light.
The speed of a wave is given in terms of wavelength and frequency as :
So, the speed of light in a shade of yellow light is 
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<span>Two lines are parallel if their slope is the same.
You want to write 8x + 4y = 5 in the form y = mx + b, where m represents the slope and b is the y-intercept.
We need to isolate y in the given equation. The number next to x is the slope.
8x + 4y = 5
4y = -8x + 5
y = (-8x +5)/4
y = -2x + 5/4
The slope of the line we want is -2.
Two lines are perpendicular if the slope of the first line times the
slope of the second line produces a product of negative one.
Since our slope is -2, we know that -2 times 1/2 yields -1.
The slope of the line perpendicular is 1/2.
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Hope this helped!
