61. If x=2, y=-3 and z= -4, evaluate (y-2)(x-2)(z - y)
A 210 B. 30 C. -30 D-210
(Nov 2013 (11)

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: