Which visible colors of light has the longest wavelength?

Red has highest wavelength

Explanation:

Electromagnetic radiation is defined as the radiation which is associated with both electrical and magnetic component. These radiations travel in vacuum as well and travel with the speed of light.

The Electromagnetic visible spectrum involves violet, indigo, blue , green, yellow, orange and red which are arranged in order of increasing wavelength and decreasing frequency.  

Thus red has highest wavelength and blue has lowest wavelength.

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue