The graph of the sine curve below is of electromagnetic energy that represents orange light:

what function accurately represents the sine curve for orange light?

a. f(x) = sin pi over 610x
b. f(x) = sin pi over 305x
c. f(x) = sin 610πx
d. f(x) = sin 305πx

Choice B
f(x) = sin((pi/305)x)



Explanation:

The general sine function is
y = A*sin(Bx-C)+D

The period is 610 nm since the curve repeats itself after this point. 
T = period
T = 610

Use this to find the value of B
B = 2pi/T
B = 2pi/610
B = pi/305

So this is why the answer is choice B) f(x) = sin((pi/305)*x)