Help me please :(

40 x 50 = 2000

step-by-step explanation:

other answer is correct. i had used the radius of the radius somehow. a website:

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:

2+2 obliviously is 4.