PROBLEM 2. What is the wavelength of a microwave with a frequency of 6500 Hz?
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PROBLEM 2. What is the wavelength of a microwave with a frequency of 6500 Hz?
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Answer:
There are two answers, but both still straight forward.
Answer 1 - Wave in a vacuum
f=cλ
where
f = frequency in per-second (Hertz, Hz )
c = speed of light in a vacuum in meters-per-second ( ms−1 )
λ = wavelength in meters ( m )
This means for your question, considering that nm means 10−9m :
f=2.9979×108633×10−9=4.736...×1014Hz
Answer 2 - Wave not in a vacuum
f=vλ
where
v = speed of light in the medium (material) it travels through
Luckily, in air this is approximately the same as the speed of light in a vacuum, so the answer stays the same to 4 decimal places