Answer:
Longitudinal wave are those in which the motion of the particles is along the direction of the medium. It always requires the medium to travel.We can say that a wave that oscillates back and forth that means moving in same interval.
And sound is the longitudinal wave that requires a medium to move.
Answer:
at maximum height velocity is zero
The full range of wavelengths of EM waves are called as the Electromagnetic Spectrum. In all possible EM radiation, this is what appears. It can subsume visible light and Xrays or radio frequencies. This is used for spectroscopic purposes at most times.
A, B & C
This phenomenon is defined as <em>relativity of simultaneity</em> by Albert Einstein.
Depending on the motion of an observer, the observer may perceive a distinct event occurring at a specific time differently from another observer with different motion.
Explanation:
This is stipulated in Albert Einstein's theory of special relativity that stipulates that the two distinct events that occur at the same time but at different places in space may appear differently to different non-accelerating observers at different vantages points (or reference frames). This is due to the interrelated nature of space and time hence it called space-time.
Learn More:
For more on special relativity theory check out;
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