If you cut the frequency of a wave by half, what happens to its wavelength if the speed remains constant? A. It decreases by half
B. In increases by half.
C. It decreases by 100%
D. It increase by double

Find an expression for the electric field e⃗ at the center of the semicircle. hint: a small piece of arc length δs spans a small angle δθ=δs /r, where r is the radius. express your answer in terms of the variables q, l, unit vectors i^, j^, and appropriate constants.