Which of the following would be measured by a micrometer? width of a fiber

size of air particles

size of a cell

number of air particles

width of a fiber, size of air particles and size of a cell can be measured by a micrometer (µm).

answer; //the above statement is (false);

measuring light intensity

light meters can be used to measure light intensity. the meter is held at the soil surface and pointed in the direction of the maximum light intensity, and then the meter is read.

errors can be made when measuring light intensity by accidentally shading the light meter. the reliability of the results can be checked by taking many samples.