Wavelength x frequency = speed of the wave, so wavelength = speed / frequency. In SI units, wavelength (in meters) = speed (in meters/second) / frequency (in Hertz). If you are talking about electromagnetic waves in avacuum, use 300,000,000 m/s for the speed.
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Spectroscope is a useful qualitative analysis tool because is it can analyze wavelengths what humans can't see especially infrared and ultraviolet radiation. Also since light has a different color of wavelengths; Scientist can find useful information such as chemical elements present at the source of the light.
12 meters
84/5 = 16.8 meters
Circumference : 94.2 meters Area : 706.5 square meters
The area of the triangle in square meters is (1/2 the length of the triangle's base, in meters) times (the length of the triangle's height, in meters).