If the Scattering Angle of the Light in Compton's Scattering $90 ^ { \circ }$

Multiple Choice

If the scattering angle of the light in Compton's scattering experiment is $90 ^ { \circ }$ , what is the change in the wavelength of the light? ( $m _ { \text {electron } } = 9.11 \times 10 ^ { - 31 } \mathrm {~kg} , c = 3.00 \times 10 ^ { 8 } \mathrm {~m} / \mathrm { s } , h = 6.626 \times 10 ^ { - 34 } \mathrm {~J} \cdot \mathrm { s }$ )

A) $3.65 \times 10 ^ { - 12 } \mathrm {~m}$
B) $1.22 \times 10 ^ { - 12 } \mathrm {~m}$
C) $4.85 \times 10 ^ { - 12 } \mathrm {~m}$
D) $2.42 \times 10 ^ { - 12 } \mathrm {~m}$