Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, t
his gun accelerates a 3.8-kg projectile from rest to a speed of 9.3 × 103 m/s. The net force accelerating the projectile is 9.3 × 105 N. How much time is required for the projectile to come up to speed?
The energy carried by a single photon of frequency f is given by: where is the Planck constant. In our problem, the frequency of the photon is , and by using these numbers we can find the energy of the photon: