Author Question: A neutral 0 (having mass 0.642 u) that is at rest decays into two gamma ray photons. What is the ... (Read 61 times)

Bob-Dole · **on:** Jul 29, 2018

A neutral 0 (having mass 0.642 u) that is at rest decays into two gamma ray photons. What is the energy in MeV of each photon? (1 u = 931.5 MeV/c2)

A) 597 MeV B) 299 MeV C) 1190 MeV D) 149 MeV E) 199 MeV

Question 2

A molecule of roughly spherical shape has a mass of 1.80 10-25 kg and a diameter of 0.6 nm.

If the uncertainty in the measured position of the molecule is equal to the molecular diameter, what is the minimum uncertainty in the speed of the molecule? (h = 6.626 10-34 J s)
A) 100 m/s B) 10 m/s C) 0.1 m/s D) 1 m/s E) 0.01 m/s