Answer:
child protective services
Explanation:
amonbgus
Answer:
b) Equal to c
Explanation:
According to relativity, the speed of light in free space is constant in all inertial reference frame.
That's wave 'diffraction'.
A supernova is a star that suddenly increases greatly in brightness because of a catastrophic explosion that ejects most of its mass.
Answer:
Doppler Theory
Explanation:
it's a theory regarding the change in wave frequency during the relative motion between a wave source and its observer.
