Why does blue light carry more energy per photon than red light?

You partially fill a glass with water, place an index card on top of the glass, and then turn the glass upside down while holding the card in place. You can then remove your hand from the card and the card remains in place, holding the water in the glass. Explain how this works.

A slab of glass that has an index of refraction of $1.50$ is submerged in water that has an index of refraction of $1.33$. Light in the water is incident on the glass. What is the angle of refraction if the angle of incidence is ) $45^{\circ}$?

Why does the Sun look reddish at sunrise and sunset?

Which statement below best describes the path of the sun through the sky on December 23 in New York State? (1) The sun rises due east, is high in the sky at noon, and sets due west. (2) The sun rises due east, its low in the sky at noon, and sets due west (3) The sun rises in the southeast, moves very high across the sky at noon, and sets in the southwest. (4) The sun rises in the southwest, moves low across the sky at noon and sets in the southwest.

Why does a forest fire tend to give the sky a pronounced reddish color?

(a) The small particles of soot and molecules produced by a fire usually have a red color.

(b) The small particulates from a fire scatter red light from the Sun less than blue light.

(c) Heat from the fire removes water vapor from the air.

In clinical situations, we monitor homeostasis of various substances such as ions, blood gases, and organic solutes by taking a blood sample and analyzing its plasma. For given of the following substances, predict whether knowing its plasma concentration also tells you its concentration in the ECF and the ICF. Defend your answer.
(c) water

In clinical situations, we monitor homeostasis of various substances such as ions, blood gases, and organic solutes by taking a blood sample and analyzing its plasma. For given of the following substances, predict whether knowing its plasma concentration also tells you its concentration in the ECF and the ICF. Defend your answer.
(d) proteins

In clinical situations, we monitor homeostasis of various substances such as ions, blood gases, and organic solutes by taking a blood sample and analyzing its plasma. For given of the following substances, predict whether knowing its plasma concentration also tells you its concentration in the ECF and the ICF. Defend your answer.
(b) K+

In the following sets of elements, indicate which element has the smallest atomic size.

d. $\mathrm{N}, \mathrm{O}, \mathrm{F}$

In the following sets of elements, indicate which element has the smallest atomic size.

c. $\mathrm{N}, \mathrm{P}, \mathrm{As}$

In the following sets of elements, indicate which element has the smallest atomic size.

b. $\mathrm{Na}, \mathrm{Si}, \mathrm{S}$

In the following sets of elements, indicate which element has the smallest atomic size.

a. $\mathrm{Na}, \mathrm{K}, \mathrm{Rb}$

Arrange the following sets of elements in order of increasing atomic size.

c. $\mathrm{Pb}, \mathrm{Ba}, \mathrm{Cs}, \mathrm{At}$