When Cs-137 Decays,it Emits Gamma Radiation

Multiple Choice

When Cs-137 decays,it emits gamma radiation.The energy of one photon is 1.06 × 10−¹³ J.What is the wavelength of this radiation?

A) 1.87 × 10−¹² m
B) 2.08 × 10−¹² m
C) 2.44 × 10−¹² m
D) 1.88 × 10−¹¹ m
E) 1.58 × 10−¹⁰ m