Aspaceship leaves a space station and emits a flash of light that travels at a speed of 300,000 km/s. the spaceship starts out travelling at 1/4 the speed of light, but ends up travelling at 99/100 the speed of light. what does a scientist on the space station measure the speed of the flash to be?

b. (1/4) x 300, 000 km/s

c. (1/100) x 300, 000 km/s

d. 300, 000 km/s

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.