We want to find how much charge is on the electrons in a nickel coin. Follow this method.
A nickel coin has a mass of about 4.1 g.
Find the number of atoms in a nickel coin.
Each mole (6.02 x 1023 atoms) has a mass of
about 58.2 g.
Answer in units of atoms.

Alinearly polarized electromagnetic wave has an average intensity of 196 w/m^2. this wave is directed towards two ideal polarizers (in real polarizers, transmission is also effected by reflection and absorption). polarizer a is oriented with its transmission axis at an angle of θ_1=20.8∘ with the incident electric field. polarizer b has its axis at an angle of θ_2=63.0∘ with the incident electric field. what is the average intensity of the wave after it passes through polarizer a? what is the average intensity of the wave after it passes through polarizer b? suppose that the two polarizers a and b are interchanged. what would the average intensity be after passing through both polarizers?

1.what is where an object is located 2. what is how fast an objects speed is changing 3. what is how fast an object is moving

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?