An input device sends information to a computer system for processing, and an output device reproduces or displays the results of that processing. Input devices only allow for input of data to a computer and output devices only receive the output of data from another device.
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frequency is equal to number of oscillations or vibrations upon time
therefore,
check picture
I think it because of UV rays ultra violet ray which can make their colors different
The first one. The E and B chatacteristic are perpendicular to eachother. The direction of the wave can be found by the right hand rule.
