WRITE ABOUT OIL PAPER EXPERIMENT
Answers
hi
Have you ever heard that white light is made up of all the different kinds of light? And maybe you’ve wondered how we actually see colors? This month we’ll discover how light behaves as it makes its way to your eyes.
Materials:
One sheet of white paper, a tissue, oil (vegetable, olive, it doesn’t matter)
Procedure:
Hold a piece of paper up to the light, blocking your view of the light. Observe the back side of the paper. Notice how dark it appears?
Now hold the paper down in front of you so the light shines right on the surface. Notice the difference from step one? It is a lot brighter.
Next put a dab of oil on the center of the paper with the tissue.
Repeat steps one and two, watching how the light changes appearance as you shift the paper .
Explanation:
When you hold the paper up to the light, you should notice it is dark. And rightly so, it is blocking the light! The other side is appearing lighter because the light it bouncing off of it away from your eyes. All the light is going the other way! When you put the paper down and look at the light on it, it appears white because this time the reflecting light bounces into your eyes.
What does the oil do to change all this?
When you hold it up to the light you should see a tiny circle of light surrounded by darkness. Why? The oil allows the light to come through and make it to your eyes while the rest of the paper without oil reflects the light away. Flip the paper down and the opposite happens! The oil spot appears dark this time and the paper is bright. All the light is going through the paper now at that one spot, making it appear dark. The rest of the paper is still reflecting light to your eyes.
hope it helps ^_^
plz mark it as brainliest
elementary electric charge (the charge of the electron).
The experiment entailed observing tiny electrically charged droplets of oil located between two parallel metal surfaces, forming the plates of a
capacitor . The plates were oriented horizontally, with one plate above the other. A mist of atomized oil drops was introduced through a small hole in the top plate and was ionized by an x-ray , making them negatively charged. First, with zero applied electric field, the velocity of a falling droplet was measured. At terminal velocity, the
drag force equals the gravitational force. As both forces depend on the radius in different ways, the radius of the droplet, and therefore the mass and gravitational force, could be determined (using the known density of the oil). Next, a voltage inducing an
electric field was applied between the plates and adjusted until the drops were suspended in mechanical equilibrium , indicating that the electrical force and the gravitational force were in balance. Using the known electric field, Millikan and Fletcher could determine the charge on the oil droplet. By repeating the experiment for many droplets, they confirmed that the charges were all small integer multiples of a certain base value, which was found to be 1.5924(17) × 10 −19 C, about 0.6% difference from the currently accepted value of
1.602 176 6208(98) × 10 −19 C[1] . [2] They proposed that this was the magnitude of the negative charge of a single electron.