GGR252H1 Final: MARKETING GEO EXAM NOTES.doc

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purplezebra711

24 Apr 2012

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Entertainment & shopping: to revitalize malls and attract customers back, entertainment is used as a drawing-card", ex. In the study: long distances between stores in an open space between the pn affected cross-shopping negatively. The entertainment facilities of the pn had a larger market area than the rm. Age differences: more teens at the mall [public transport made it easy to access] while people in the 30"s-40"s preferred the. More people with incomes under 50k were found at the rm and higher than 70k was found at the pn. Entertainment customers of the pn are older and less culturally diverse. Spending on entertainment at the rm was higher for purchases under and pn -50. Anchor tenants placed at opposite ends to generate traffic. People tended to take advantage of the power node; 1/10 said it was visually appealing and 1/3 believed that the big box stores offered more variety than the conventional stores you find in the malls.

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Toymakers have always been interested in springs for the entertainment value of the motion they produce. One well-known application is a baby bouncer, (Intro 1 figure) which consists of a harness seat for a toddler, attached to a spring. The entire contraption hooks onto the top of a doorway. The idea is for the baby to hang in the seat with his or her feet just touching the ground so that a good push up will get the baby bouncing, providing potentially hours of entertainment. The following chart depicts an experiment to determine the spring constant for a baby bouncer.

Displacement from equilibrium, x (m)	Force exerted on the spring, F (N)
0	0
0.005	2.5
0.010	5
0.015	7.5
0.020	10

What is the spring constant k of the spring being tested for the baby bouncer?

Express your answer to two significant figures in newtons per meter.

k=______N/m

coffeeeel947

A popular entertainment at some carnivals is the blankettoss.
A) If a person is thrown to a maximum height of 28.0ft above theblanket, how long does she spend in the air?
B)Is the amount of time the person is above a height of 14.0 feetmore than, less than, or equal to the amount of time the person isbelow 14.0 ft? Explain.
C) Verify part B with a calculation.

The emergence of line spectra from a gas when a current passesthrough it was an observed phenomenon waiting for an explanation inthe early 20th century. The atomic line spectra coming fromelements such as hydrogen had been analyzed since the late 19thcentury. By studying the wavelength of the emerging radiation ofhydrogen, experimenters found (often by trial and error) that thewavelengths in those spectra were described by the formula

\frac{1}{\lambda} = R \left( \frac{1}{n_1^2} - \frac{1}{n_2^2}\right),
where R is known as the Rydberg constant. It has a value of R =1.097 \times 10^{7}\; \rm m^{-1}. The variables n_1 and n_2 areinteger numbers (n_1 = 1,2,3,4,\dots). As experiments continued,scientists began to see more and more characteristic lines emergingfrom the hydrogen spectrum. Each of them corresponded to awavelength predicted by this formula with some integer values forn_1 and n_2.

In 1913, Niels Bohr provided an explanation for the observationsmade in experiments by proposing that each electron in an atom hadonly certain allowable energy levels. Furthermore, he postulatedthat when an electron changed its energy level, it must emit orabsorb a single photon with the energy equal to the energydifference between the two levels.

With this interpretation, the variables n_1 and n_2 acquired newsignificance. Bohr's model predicted that n_2 was the initialenergy state of the atom (n_initial) and that n_1 was the finalstate of the atom (n_final). A photon with the predicted wavelengthwas created when an atom made a transition from its initial energystate to a lower final energy state. The equation now read

\frac{1}{\lambda} = R \left( \frac{1}{n_{\rm final}^2} -\frac{1}{n_{\rm initial}^2} \right).
Bohr's model also predicted that a photon of the appropriatewavelength (given by the same formula) could promote an atom from alower energy level to a higher one.

In this problem, we explore the photon characteristics necessaryfor transitions between energy levels in hydrogen and singlyionized {\rm He}^+, whose energy levels are accurately predicted bythe Bohr model.
What is the change in energy DeltaE of the hydrogen atom as theelectron makes the transition from the n=3 energy level to the n=1energy level?
Express your answer numerically in electron volts.

b. When an atom makes a transition from a higher energy level to alower one, a photon is released. What is the wavelength of thephoton that is emitted from the atom during the transition from n=3to n=1?
Express your answer numerically in angstroms.

c.

When the hydrogen atom makes the transition from the n=2 to the n=1energy level, it emits a photon. This photon can be absorbed by toa singly ionized helium atom ({\rm He}^+) in its second energylevel (n_{\rm initial} = 2), causing it to move to a higher energylevel. To what final energy level number n_final can the photonpromote the helium ion?

Note that {\rm He}^+ has two protons in its nucleus and a singleelectron.
Express your answer as an integer.

Please answer fully, Thank you
a.

GGR252H1 Final: MARKETING GEO EXAM NOTES.doc

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