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9

Step-by-step explanation:

inverse operations:                                                                                                                    10 - 28 = 18                                                                                                                                   18 / 2 = 9

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: