13.The wavelength of a yellow photon is 550 nm. If an electron has the same wavelength, what is the velocity of the electron?(A) 1.32×10³ m/s (B) 2.32×10⁴ m/s (C) 3.34×10⁴ m/s (D) 6.12×10⁵ m/s (E) 8.31×10⁵ m/s

1.In the figure shown on the right, a wire is extended from y = -(a+L) to y = a+L and is bent as a semicircle in the xy plane. If the wire carries a current I flowing along the direction indicated by the arrows and the magnetic flux density B in the region is along the +z direction, determine the magnetic force acting on the semicircular arc with the following parameters: I = 2 A, B = 5 T, a = 1 m, L = 2 m. (A) 10 Nt (B) 20 Nt (C) 30 Nt (D) 40 Nt (E) 5 Nt

13.The wavelength of a yellow photon is 550 nm. If an electron has the same wavelength, what is the velocity of the electron?
(A) 1.32×10³ m/s
(B) 2.32×10⁴ m/s
(C) 3.34×10⁴ m/s
(D) 6.12×10⁵ m/s
(E) 8.31×10⁵ m/s

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