Help what is 4/10 equivalent to only 3 please help

0.4

Step-by-step explanation:

4÷10

2/5,8/20,12/30

Step-by-step explanation:

As a decimal 4/20 is equal to 0.4 or 0.40

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: