How to find the y-intercept on a scientific calculator?

press the 2nd button and click calc (which is on top of the trace button at the top right).

Scroll down to find value click it then set x to zero then click enter.

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: