Use the answer space provided to arrange the letters for the following electromagnetic radiation sources in
order of increasing frequency.
a. A red traffic light at 700 nm.
b. The frequency for WZLX, transmitting FM radio waves at 100.7 MHz on the radio dial.
c. Ultraviolet light at 345 nm that is blocked by “Sun Block” to prevent your skin from burning from
exposure to the sun.
d. A green LED light with a wavelength of 555 nm.
e. An infrared heat lamp emitting at a frequency of 3 × 1013 Hz.
Answer: ________ < ________ < ________ < ________ < ________
radio is the lowest , and UV is the highest
they give wavelengths for red and green
infrared is below red
So b<a<e<d<c
To arrange the letters for the electromagnetic radiation sources in order of increasing frequency, we need to understand that frequency and wavelength are inversely related. In other words, as the frequency of radiation increases, its wavelength decreases, and vice versa.
Here's how we can determine the order:
a. A red traffic light at 700 nm:
The wavelength is given as 700 nm.
b. The frequency for WZLX, transmitting FM radio waves at 100.7 MHz:
The frequency is given as 100.7 MHz. However, MHz stands for megahertz, which is a unit of frequency equal to 10^6 Hz. So, to convert MHz to Hz, we multiply by 10^6:
100.7 MHz = 100.7 × 10^6 Hz
c. Ultraviolet light at 345 nm blocked by "Sun Block":
The wavelength is given as 345 nm.
d. A green LED light with a wavelength of 555 nm:
The wavelength is given as 555 nm.
e. An infrared heat lamp emitting at a frequency of 3 × 10^13 Hz:
The frequency is given as 3 × 10^13 Hz.
Now that we have the frequencies and wavelengths for each source, let's arrange them in increasing order of frequency:
a. A red traffic light at 700 nm: This corresponds to a lower frequency.
b. The frequency for WZLX, transmitting FM radio waves at 100.7 × 10^6 Hz: This is higher than the red traffic light.
c. Ultraviolet light at 345 nm: This corresponds to a higher frequency.
d. A green LED light with a wavelength of 555 nm: This corresponds to a lower frequency compared to ultraviolet light.
e. An infrared heat lamp emitting at a frequency of 3 × 10^13 Hz: This is the highest frequency among the given sources.
So, the order of increasing frequency is:
a. A red traffic light at 700 nm < d. A green LED light with a wavelength of 555 nm < c. Ultraviolet light at 345 nm < b. The frequency for WZLX, transmitting FM radio waves at 100.7 MHz < e. An infrared heat lamp emitting at a frequency of 3 × 10^13 Hz.
Putting it all together, the answer is:
a. < d. < c. < b. < e.