An architect notices that the scale on a blueprint he is using has been torn off. however, he sees that a 12.5-ft. wall that has been built is 5 in. long on the blueprint. what is the scale for this blueprint?

explanation:

infrared radiation has wavelength in the range between 700 nm and 1 mm. lets' convert these values into scientific notation, keeping in mind that:

let's start from the lower value, we have:

(we moved the dot two places to the left, so we increased the exponent by 2 units, from -9 to -7)

the higher value is:

so, the range of wavelength of infrared radiation is: