Multiple Choice
In the SI system, frequency is measured in which unit?
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1. Intro to Physics Units
Introduction to Units
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Astronomers often detect radio waves with wavelengths of 3,000,000,000 nm. What is this wavelength expressed in decameters (dam)?
A
3 dam
B
0.3 dam
C
30 dam
D
0.03 dam
Verified step by step guidance1
Start by understanding the units involved: the given wavelength is in nanometers (nm), and we need to convert it to decameters (dam).
Recall the conversion factors: 1 nanometer (nm) is equal to 1 x 10^-9 meters (m), and 1 decameter (dam) is equal to 10 meters (m).
Convert the given wavelength from nanometers to meters using the conversion factor: 3,000,000,000 nm * (1 x 10^-9 m/nm).
Now, convert the result from meters to decameters using the conversion factor: result in meters * (1 dam/10 m).
Simplify the expression to find the wavelength in decameters. This will give you the final answer.
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