Enhanced College Physics 7th. Edition by Raymond A. Serway, Jerry S. Faughn, Chris Vuille, Charles A. Bennett | 9780495113690 | 0495113697 | Holooly

Enhanced College Physics

315 SOLVED PROBLEMS

Question: 25.5

Hubble Power Goal Understand magnification in telescopes. Problem The Hubble telescope is 13.2 m long, but has a secondary mirror that increases its effective focal length to 57.8 m. (See Fig. 25.11.) The telescope doesn’t have an eyepiece, because various instruments, not a human eye, record the ...

Verified Answer:

Solve for

f_{e}

in Equation 25.8 an...

Question: A.1

Solve the following two simultaneous equations: (1) 5x + y = -8 (2) 2x – 2y = 4 ...

Verified Answer:

From (2), we find that x = y + 2 Substitution of ...

Question: 29.9

Synthetic Elements Goal Construct equations for a series of radioactive decays. Problem (a) A beam of neutrons is directed at a target of 92^238U . The reaction products are a gamma ray and another isotope. What is the isotope? (b) The isotope 92^239U is radioactive and undergoes beta decay. Write ...

Verified Answer:

(a) Identify the isotope produced by the reaction ...

Question: 29.8

The Discovery of the Neutron Goal Balance a nuclear reaction to determine an unknown decay product. Problem A nuclear reaction of significant note occurred in 1932 when Chadwick, in England, bombarded a beryllium target with alpha particles. Analysis of the experiment indicated that the following ...

Verified Answer:

Write an equation relating the atomic masses on ei...

Question: 29.7

Should We Report This to Homicide? Goal Apply the technique of carbon-14 dating. Problem A 50.0-g sample of carbon is taken from the pelvis bone of a skeleton and is found to have a carbon-14 decay rate of 200.0 decays/min. It is known that carbon from a living organism has a decay rate of 15.0 ...

Verified Answer:

Calculate the original activity

R_{0}[/late...

Question: 29.6

The Beta Decay of Carbon-14 Goal Calculate the energy released in a beta decay. Problem Find the energy liberated in the beta decay of 6^14C to 7^14N , as represented by Equation 29.13. That equation refers to nuclei, while Appendix B gives the masses of neutral atoms. Adding six electrons to both ...

Verified Answer:

Obtain the masses of

{ }_{6}^{14} \mathrm{C...

Question: 29.5

Decaying Radium Goal Calculate the energy released during an alpha decay. Problem We showed that the 88^226Ra nucleus undergoes alpha decay to 86^222Rn (Eq. 29.10). Calculate the amount of energy liberated in this decay. Take the mass of 88^226Ra to be 226.025 402 u, that of 86^222Rn to be ...

Verified Answer:

Compute the sum of the mass of the daughter partic...

Question: 29.4

Radon Gas Goal Calculate the number of nuclei after an arbitrary time and the time required for a given number of nuclei to decay. Problem Radon 86^222Rn is a radioactive gas that can be trapped in the basements of homes, and its presence in high concentrations is a known health hazard. Radon has a ...

Verified Answer:

(a) How many atoms will remain after 14.0 days hav...

Question: 29.3

The Activity of Radium Goal Calculate the activity of a radioactive substance at different times. Problem The half-life of the radioactive nucleus 88^226Ra is 1.6 ×10³ yr. If a sample initially contains 3.00 ×10^16 such nuclei, determine (a) the initial activity in curies, (b) the number of radium ...

Verified Answer:

(a) Determine the initial activity in curies. Conv...

Question: 29.2

The Binding Energy of the Deuteron Goal Calculate the binding energy of a nucleus. Problem The nucleus of the deuterium atom, called the deuteron, consists of a proton and a neutron. Calculate the deuteron’s binding energy in MeV, given that its atomic mass—that is, the mass of a deuterium nucleus ...

Verified Answer:

To find the binding energy, first sum the masses o...

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