The after glow from some clock faces is caused by atoms
1) being excited,
2) vibrating at frequencies greater than a million billion times per second,
3) remaining for some time in a state of excitation before de-exciting,
and materials exhibiting this property are called
4) fluorescent.
5) phosphorescent.
6) incandescent.
7) luminescent.
Question 2
A spectrum of colors seen in gasoline on a wet street is primarily a result of
1) interference,
2) polarization,
3) refraction,
4) scattering,
5) diffraction,
where
6) the light reaching the eye is polarized by double reflection.
7) only the higher frequencies of light resonate with the gasoline and H2O molecules.
8) the thin film of gasoline spreads the light out into its component colors.
9) light reflecting from the gasoline surface interferes with light reflecting from the water surface.
Plastid composition of egg cells from green, white, and variegated four-o'clock plants.
Formation of additional eyes in Drosophila caused by the abnormal expression of a master control gen
Many human diseases are caused by mutations in single genes
mushroom that glow in the dark
Hydronephrosis. Normal kidney (left) and kidney with hydronephrosis (right) are compared. Note the d
Opener Pigment mutations within an ear of corn, caused by transposition of the Ds element