An EM wave has a wavelength of 620 nm.
What is its frequency?
How would we classify it?
620 nm = 620*10^-9 m. = 6.2*10^-7 m.
L = V/F.
F = V/L = 3*10^8m/s / 6.2*10^-7m = 4.839*10^14 cycles/s = 4.839*10^14 Hz.
To find the frequency of an electromagnetic (EM) wave, you can use the formula:
frequency = speed of light / wavelength
The speed of light is a fundamental constant equal to approximately 3.00 x 10^8 meters per second (m/s). However, we need to convert the wavelength from nanometers (nm) to meters (m) before we can proceed with the calculation.
To convert 620 nm to meters, we divide by 10^9:
620 nm = 620 x 10^(-9) m = 6.20 x 10^(-7) m
Now we can substitute the values into the formula:
frequency = (3.00 x 10^8 m/s) / (6.20 x 10^(-7) m)
frequency ≈ 4.839 x 10^14 Hz
Therefore, the frequency of the EM wave is approximately 4.839 x 10^14 Hz.
To classify the EM wave, we can refer to the electromagnetic spectrum. This spectrum categorizes waves based on their wavelengths and frequencies. In this case, with a wavelength of 620 nm (or 6.20 x 10^(-7) m) and a frequency of approximately 4.839 x 10^14 Hz, the wave falls within the visible light region of the electromagnetic spectrum.
Visible light is the range of wavelengths that can be detected by the human eye, spanning from approximately 400 nm to 700 nm. Since the given wavelength of 620 nm is within this range, the wave would be classified as visible light.