A Navigational Beacon in Deep Space Broadcasts at a Radio

Multiple Choice

A navigational beacon in deep space broadcasts at a radio frequency of 50 MHz.A spaceship approaches the beacon with a relative velocity of 0.40c.The spaceship passes the beacon and departs from it with a DIFFERENT relative velocity.The beacon signal is now detected at a frequency of 40 MHz.What is the new velocity of the spaceship relative to the beacon?

A) 0.20c
B) 0.22c
C) 0.24c
D) 0.26c
E) 0.28c