While being X-rayed, a person absorbs $3.2 \times 10^{-3} \mathrm{J}$ of energy. Determine the number of 40,000-eV X-ray photons absorbed during the exam.

At the atomic-scale, the electron volt and nanometer are well-suited units for energy and distance, respectively. (b) How much energy ( $\mathrm{eV})$ does a 650 -nm photon have?

What age group do you think this essay would appeal to most? Why?

The cathode-ray tubes that generated the picture in early color televisions were sources of $\mathrm{x}$ rays. If the acceleration voltage in a television tube is $15.0 \mathrm{~kV}$, what are the shortest wavelength $x$ rays produced by the television? (Modern televisions contain shielding to stop these $\mathrm{x}$ rays.)

Use the random numbers to solve the following problem. Tankers arrive at an oil port with the distribution of interarrival times shown in Table 12. The port has two terminals, A and B. Terminal B is newer and therefore more efficient than terminal A. The time it takes to unload a tanker depends on the tanker’s size. A supertanker takes 4 days to unload at terminal A and 3 days at terminal B. A midsize tanker takes 3 days at terminal A and 2 days at terminal B. The small tankers take 2 days at terminal A and 1 day at terminal B. Arriving tankers form a single waiting line in the port area until a terminal becomes available for service. Service is given on an FCFS basis. The type of tankers and the frequency with which they visit this port is given by the distribution in Table 13. Develop a simulation model for this port. Compute such statistics as the average number of tankers in port, the average number of days in port for a tanker, and the percentage of idle time for each of the terminals. TABLE 12:

$$\begin{matrix} \text{Interarrival Times (days)} & \text{Probability}\\ \text{1} & \text{.20}\\ \text{2} & \text{.25}\\ \text{3} & \text{.35}\\ \text{4} & \text{.15}\\ \text{5} & \text{.05}\\ \end{matrix}$$

TABLE 13:

$$\begin{matrix} \text{Type of Tanker} & \text{Probability}\\ \text{Supertanker} & \text{.40}\\ \text{Midsize tanker} & \text{.35}\\ \text{Small tanker} & \text{.25}\\ \end{matrix}$$

Determine the balance after 20 years when $2000 is invested at 7% compounded (a) quarterly and (b) continuously

Write the numbers in these group in order from least to greatest. 9.7, -9.8, 8.6, 0.9

Light of wavelength $360 \mathrm{~nm}$ strikes a metal whose work function is $2.4 \mathrm{eV}$. What is the shortest de Broglie wavelength for the electrons that are produced as photoelectrons?

Prove that a finite group G is nilpotent if and only if whenever a, $b \in G$ with (|a|, |b|) = 1 then ab = ba.

(a) A body cell of $1.0 \times 10^{-5}$-m radius absorbs $4.2 \times 10^{-14} \mathrm{J}$ of X-ray radiation. If the energy needed to produce one positively charged ion is 100 eV, how many positive ions are produced in the cell? (b) How many ions are formed in the $3.0 \times 10^{-6}$-m-radius nucleus of that cell (the place where the genetic information is stored)?

Provide an example of an adjustment that improves the income statement and the balance sheet, but has no effect on cash flows.

Find the maximum kinetic energy of electrons ejected from a certain material if the material’s work function is 2.3 eV and the frequency of the incident radiation is

$$3.0 × 10^15 Hz$$

.

Use absolute value to describe the relationship between a negative credit card balance and the amount owed.

Suggest an explanation for the fact that the Group 13 elements have a common +3 ionic charge.