What is the speed of a wave

What is the speed of a wave - mm 10-3 Infrared Centimeter...

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What is the speed of a wave? Imagine you are on the beach watching the ocean waves go by, and you want to know the speed of the waves. There is an island offshore with a palm tree that will serve as a convenient frame of reference. You count the number of waves that pass by the tree in one minute: In this case, two peaks (two wavelengths) pass by the tree in one minute. Thus, the frequency is 2 wavelengths/minute. If we measure the distance between the peaks (i.e. the wavelength) we can determine the speed of the wave: Speed of the wave = (distance between peaks) * (frequency) = (wavelength) * (frequency) The unit of length chosen to describe a particular wavelength is typically dependent on the type of electromagnetic radiation Unit Symbol Length (m) T Angstrom Å 10 -10 X-ray Nanometer nm 10 -9 UV, visib Micrometer m 10 -6 Infrared
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Unformatted text preview: mm 10-3 Infrared Centimeter cm 10-2 Microwa Meter m 1 TV, radio The range of EM wavelengths is dramatic The wavelengths of gamma-rays (<0.1 ) are similar to the diameter of atomic nuclei The wavelengths of some radio waves can be larger than a football field Frequency Frequency is expressed in cycles per second , also known as hertz ( Hz ) Usually the dimension 'cycles' is omitted and frequencies thus have the dimension of s-1 Sodium vapor lamps are sometimes used for public lighting. They give off a yellowish light with a wavelength of 589 nm. What is the frequency of this radiation? frequency*wavelength = speed of light frequency = speed of light/wavelength = (3.00x10 8 m/s)/(589x10-9 m) = 5.09 x 10 14 s-1 = 5.09 x 10 14 cycles per second or 5.09 x 10 14 hertz...
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What is the speed of a wave - mm 10-3 Infrared Centimeter...

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