By CK-12 Foundation
CK-12 uncomplicated Physics - moment version covers the next chapters:Units: This bankruptcy covers the fundamental devices utilized in physics, instructions for utilizing devices, and their significance inside of physics.Wave: This bankruptcy covers items in harmonic movement, that are outlined as gadgets that go back to an identical place after a set time period. items in harmonic movement be capable to move a few of their strength over huge distances. gentle Nature: This bankruptcy covers the character of sunshine, polarization, and colour.
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What is the Period and frequency of your friend舗s tapping? Your tapping starts small waves going down the desk. Sort of like hitting a bell with a hammer. The frequency of the sound you hear is 1200 Hz. You know the wave speed in wood is about 3600 m/s. Find the wavelengths generated by your tapping. Give some everyday examples of simple harmonic motion. The pitch of a Middle C note on a piano is 263 Hz. This means when you hear this note, the hairs (cilia) in your inner ears wiggle back and forth at this frequency.
Our eyes include color-sensitive and brightness-sensitive cells. The three different color-sensitive cells (cones) can have sensitivity in three colors: red, blue, and green. Our perception of other colors is made from the relative amounts of each color that the cones register from light reflected from the object we are looking at. Our brightness-sensitive cells (rods) work well in low light. This is why things look 舖black and white舗 at night. The chemical bonds in pigments and dyes 舑 like those in a colorful shirt 舑 absorb light at frequencies that correspond to certain colors.
This is due to the way our eyes see color and the chemical reactions in the cone cells of the retina. Mixing these colors will produce the secondary, or complementary colors: magenta, cyan and yellow, as well as white. On the diagram below label colors to show how this works: Color printers use a different method of color mixing: color mixing by subtraction. What colors are used in this process? (HINT: look at the ink colors in an ink-jet printer, CYMB). The idea here is that each color subtracts from the reflected light 舑 for example, cyan ink reflects blue and green but SUBTRACTS red.