3. Two spaceships are heading towards each other with speeds of Doc. Dne ship shines a laser beam at the other. How will each ship see the light?I a. Both will see the light travel at Doc. 1:. Both will see the light travel at c. c. One ship will see the light at 1.3; the other will see the light travel at Bic. d. Both will see the light travel at DEC. 9. The following graph shows Millikan's data for y W! determining the threshold frequency for a given material by varying the frequency of the incident light. Which of the following will change the threshold frequency, lo? a. Use a different metal Increase the light intensity Increase the light f'requency t] . . n K It)\" llzt Ll 2 4 ' II H \"J I: h. c. d. Decrease the light intensity . _ e. f\" = 4.39 I Io'l H3. Decrease the light frequency 10. If an astronaut who has only aged 3 years returns to Earth 15 years later, how fast was his ship travelling? a. I120 c h. [Mic c. [LED c d. 0.9 8c e. 1.02 c