Answer: D. Time and length
Explanation.
Time is always measured relative to some reference time, so it is relative.
Mass is the matter that defines an object. It could be converted into energy but its quantity does not change, so it is not relative.
Length is a measurement that is compared against a standard, so it is relative.
No atoms create electricity and radiation
the answer would be B) displacement of particles is perpendicular to the direction of wave motion
Answer: Resonance
Explanation:
Resonance is a vibration set up in a body (house windows) due to a transfer of energy from another body (loud bass speaker) which is vibrating with a same or nearly equal frequency as that of the first.
Thus, resonance explains that once the natural frequency of the windows happens to be the same as the frequency of the speaker, vibrations occurs.