[PDF] Top 20 20 Instructor Solutions Manual

... 24. The magnetic domains in the unmagnetized piece of iron are initially pointing in random directions, as in Fig. 20–42a (which is why it appears to be unmagnetized). When the south pole of a strong external ... See full document

... ( a ) At the threshold wavelength, the kinetic energy of the photoelectrons is zero, so the work function is equal to the energy of the photon.. 27–5b to calculate the maximum kinetic [r] ... See full document

... 7. (d) A common misconception is that it would take twice the half-life, or 20 years, for the substance to completely decay. This is incorrect because radioactive decay is an exponential process. That is, during ... See full document

... 8. Yes, radio waves can have the same frequencies as sound waves. These 20- to 20,000-Hz EM waves would have extremely long wavelengths when compared to the sound waves, because of their high speed. A 5000-Hz ... See full document

... ( b ) After the first capacitor is disconnected from the battery, the total charge must remain constant, and the voltage across each capacitor must be the same, since each capacitor pl[r] ... See full document

... We combine the expression for the frequency in a closed tube with the Doppler shift for a source moving away from a stationary observer, Eq... As the train approaches, the observed freq[r] ... See full document

... 13. The 15-A fuse is blowing because the circuit is carrying more than 15 A of current. The circuit is probably designed to only carry 15 A, so there might be a “short” or some other malfunction causing the current to ... See full document

... 20. Radiotelescopes are large primarily because the wavelength of radio waves is large—on the order of meters to hundreds of meters. To get better resolution with a large wavelength, the Rayleigh criterion says ... See full document

... The phase difference caused by the path difference back and forth through the coating must correspond to half a wavelength in order to produce destructive interference.. We first find t[r] ... See full document

... The statement to justify is this: “Equivalently, the image distance is positive for a real image and negative for a virtual image.” The three cases to consider are for a diverging lens,[r] ... See full document

... Since the increasing clockwise current in the front loop is causing an increase in the number of magnetic field lines down through the second loop, Lenz’s law states that the second lo[r] ... See full document

... 1. For an underdamped oscillation, the period is approximately equal to the period of an undamped oscillation. The period is related to the mass and spring constant as in Eq. To measure[r] ... See full document

... the solutions manual, relative to the 2002 class, which did not have access to the solutions ...the instructor, since the two classes were as similar in these aspects as likely to be ... See full document

... 20. The absorbed dose measures the amount of energy deposited per unit mass of absorbing material and is measured in grays (Gy) or rads. The gray is the SI unit and is 1 J/kg. A rad is 0.01 Gy. The effective dose ... See full document

... 20. Neon is a “closed shell” atom—a noble gas. All of its shells are completely full and spherically symmetric, so its electrons are not readily ionized. Sodium is a Group I atom (an alkali metal) that has one ... See full document

... When using conservation of energy to relate the total initial kinetic energy (translational and rotational) to the final potential energy, the mass and radius of the objects cancel out[r] ... See full document

... In this interaction, energy is conserved (initial potential energy of mass–compressed spring system = final kinetic energy of moving blocks) and momentum is conserved, since the net ext[r] ... See full document

... The electric field is strongest to the right of the positive charge (on the line connecting the two charges), because the individual fields from the positive charge and negative charge [r] ... See full document

... 20. If you mistakenly use an ammeter where you intend to use a voltmeter, then you are inserting a short in parallel with some resistance. That means that the resistance of the entire circuit has been lowered, ... See full document

... 16. The slope of the position versus time curve is the object’s velocity. The object starts at the origin with a constant velocity (and therefore zero acceleration), which it maintains for about 20 s. For the ... See full document