Multiple choice questions. Please help ASAP!
A.
When an object is moving with 40050 km/s, the original blue light is now seen as yellow light, the object is.
a. moving away from the observer
b. moving towards the observer
c. is stationary.
B.
what is the change in wavelength?
a. no change
b. increased about 100 nm
c. decreased about 100 nm
d. not enough information to determine if it is increased or decreased.