How close a series of measurements are to each other
a)precision
b)accuracy
c)percent error
d)significant figures

The answer to the question above is letter "A. precision". This indicates the closeness of the values to one another. Accuracy indicates the closeness of a measured value to the accepted one. The percent error refers to the deviation of the value from the true value and significant figures refers to the number of digits in a measurement that are considered important.

The infrared (ir) and the ultraviolet(uv) represent the two extremities of the visible spectrum (400-700nm). while ir represents electromagnetic radiation with wavelengths longer than those of visible light, uv represents wavelengths shorter than visible light