The amplitude of a wave tells us about the intensity or brightness of the light relative to other light waves of the same wavelength.
Answer:
62.5 %
Explanation:
Let the initial intensity of unpolarized light is Io.
After first polariser the intensity of light becomes I'.
So, 
Now it passes through another polariser. The angle between the first polariser and the second polariser is given by Ф. The intensity is I''.
According to the law of Malus

Here, Ф = 30 degree

The percentage change in the intensity is given by

= 62.5 %
The qualities that Galileo , Sir Isaac Newton, and Albert Einstein is that they all created models of nature. Galileo discovered Jupiter's four moons and declared that the earth revolves around the sun.Newton developed the three laws of motion, which formed the basic principles of modern physics.Albert Einstein discovered the general theory of relativity, but best known for his mass-energy equivalence formula E=mc².
Answer:
22.1 V
Explanation:
We are given that




Using 
We know that

In series



Substitute the values




Voltage across the 2.5 square cm wire=
Voltage across the 2.5 square cm wire=
Voltage across the 2.5 square cm wire=22.1 V