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.
It depends on the circuit. Sometimes it becomes a bit weaker, sometimes it stays the same.
Answer:
B.
The light waves are completely blocked.
Explanation:
The intensity of the light coming out after two polarizers is given by Malus' Law:
![I=I_0 cos^2 \theta](https://tex.z-dn.net/?f=I%3DI_0%20cos%5E2%20%5Ctheta)
where
is the initial intensity of light before the polarizers
is the intensity of light after the two polarizers
is the angle between the axes of the two polarizers
In this problem, we have two polarizers with their axes placed perpendicular to each other: this means that the angle is 90 degrees
![\theta=90^{\circ}](https://tex.z-dn.net/?f=%5Ctheta%3D90%5E%7B%5Ccirc%7D)
Therefore, the cosine factor is zero:
![cos 90^{\circ} = 0](https://tex.z-dn.net/?f=cos%2090%5E%7B%5Ccirc%7D%20%3D%200)
And this means that the intensity of light after the two polarizers is also zero:
![I=I_0 cos^2 90^{\circ} = I_0 \cdot 0 = 0](https://tex.z-dn.net/?f=I%3DI_0%20cos%5E2%2090%5E%7B%5Ccirc%7D%20%3D%20I_0%20%5Ccdot%200%20%3D%200)
So, the correct option is
B. The light waves are completely blocked.
Like the law says you can't crest energy