Why does our theory predict that neutron stars will have strong magnetic fields?
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All stars have magnetic fields, and some have fields 100 times stronger than the Sun's. The field is frozen into the ionized gas of the star, and when it collapses into a neutron star, the field is squeezed down, concentrated, and made as much as a billion times stronger. Neutrons have no charge, so they can't anchor a magnetic field, but they are unstable and spontaneously decay into protons and electrons. Those particles are immediately forced by the pressure to merge back into neutrons, but at any moment about 10 percent of the particles in a neutron star and protons and electrons, which have electrical charges so powerful electrical currents can flow in a neutron star and sustain a very strong magnetic field.
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Galaxy A is 300 Mpc from Galaxy B. Hubble's Law says that V=H0 x D. About how fast is Galaxy A receding from the perspective of Galaxy B? Use a value of 75 km/s/Mpc for Hubble's constant.
A. 225 km/s B. 30000 km/s C. 75 km/s D. 22500 km/s E. 15000 km/s
Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.80 eV
What is the maximum kinetic energy that a photoelectron ejected in this process can have? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s) A) 0.62 × 10-19 J B) 0.21 × 10-19 J C) 0.36 × 10-19 J D) 0.48 × 10-19 J E) 0.33 × 10-19 J
A buried power cable as described in Example Problem 3-15, is 0.46 inches in diameter and is 3 feet below grade. The cable will be expected to transmit 1200 amperes at 440 volts. Estimate the equilibrium temperature.
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The collision of two neutron stars might be detected as what?
A. a nebula. B. an atmospheric window C. an emission-line spectrum. D. a gamma-ray burst. E. All of these choices are correct.