What are the literal and symbolic meanings of each character or object from the allegory? Use a chart like this one to record your answers.

How much energy (in kJ) do 3.0 moles of photons, all with a wavelength of 665 nm, contain?

A pulsed argon laser of 476.5-nm wavelength emits $3.0 \times 10^{-3} \mathrm{J}$ of energy to produce a tiny weld to repair a detached retina. How many photons are in the laser pulse?

For the statement, write in symbolic form:

(a). the inverse (b). the converse ($c$). the contrapositive.

$$t \rightarrow \sim w$$

Let p and q represent the following simple statements: p: This is an alligator. q: This is a reptile. Write each compound statement in symbolic form. Being an alligator is sufficient for being a reptile.

A random sample of $n=100$ measurements has been selected from a population with unknown mean $\mu$ and known standard deviation $\sigma=10$. Calculate the width of the confidence interval for $\mu$ for the confidence levels given in the exercise. What effect do the changing confidence levels have on the width of the interval? $95 \%(\alpha=.05)$

Write one of the following terms that best describes each number: natural number, whole number, integer, terminating decimal, repeating decimal, fraction, or mixed number. If a number is not rational, write not rational. $3 \frac { 1 } { 2 }$

a. Write each statement in symbolic form. Assign letters to simple statements that are not negated. b. Construct a truth table for the symbolic statement in part (a). c. Use the truth table to indicate one set of conditions that makes the compound statement true, or state that no such conditions exist. It is not true that I bought a meal ticket and did not use it.

Using p and q below, write the symbolic statement in words. p : Points X, Y, and Z are collinear. q : Points X, Y, and Z lie on the same line. $\sim p \rightarrow \sim q$

A mole of yellow photons of wavelength 527 nm has __________ kj of energy.

A satellite in Earth orbit maintains a panel of solar cells of area

$$2.90 m^2$$

perpendicular to the direction of the Sun's light rays. The intensity of the light at the panel is

$$1.39 \mathrm { kW } / \mathrm { m } ^ { 2 }$$

. (a) At what rate does solar energy arrive at the panel? (b) At what rate are solar photons absorbed by the panel? Assume that the solar radiation is monochromatic, with a wavelength of 550 nm, and that all the solar radiation striking the panel is absorbed. (c) How long would it take for a "mole of photons" to be absorbed by the panel?

Photons are emitted in the Lyman series as hydrogen atoms undergo transitions from various excited states to the ground state. If ground-state He^+ are present in the same gas (near stars, for example), can they absorb these photons? Explain .

a. What downward transitions are possible for a sodium atom in the $6 s$ state? (See Figure 42.25.) b. What are the wavelengths of the photons emitted in each of these transitions?

A hunter wishes to cross a river that is 1.5 km wide and that flows with a speed of 5.0 km/h. The hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time necessary for crossing?