Elijah started his hike at an elevation of 215 feet below sea level. Throughout the hike, he ascended 2,400 feet and then descended 576 feet. How much did his elevation change? A. 3,191 feet
B. 1,609 feet
C. 2,761 feet
D. 2,039 feet

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: