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Chapter 37: Q. 7 (page 1081)
A ceramic cube on each side radiates heat at . At what wavelength, in , does its emission spectrum peak? Assume .
The wavelenght will be
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An alpha particle (a bare helium nucleus with ) acceler-ates across a potential difference, starting from rest. What is the particle’s kinetic energy in eV when it reaches the negative electrode? This question requires no mathematics beyond what you can do in your head.
Electrons pass through the parallel electrodes shown in FIGURE with a speed of . What magnetic field strength and direction will allow the electrons to pass through without being deflected? Assume that the magnetic field is confined to the region between the electrodes
An electron in a cathode-ray beam passes between long parallel-plate electrodes that are apart. A
, wide magnetic field is perpendicular to the electric field between the plates. The electron passes through the electrodes without being deflected if the potential difference between the plates is .
a. What is the electron’s speed?
b. If the potential difference between the plates is set to zero, what is the electron’s radius of curvature in the magnetic field?
FIGURE Q36.6 shows a rocket traveling from left to right. At the instant it is halfway between two trees, lightning simultaneously (in the rocket’s frame) hits both trees.
a. Do the light flashes reach the rocket pilot simultaneously? If not, which reaches her first? Explain.
b. A student was sitting on the ground halfway between the trees as the rocket passed overhead. According to the student, were the lightning strikes simultaneous? If not, which tree was hit first? Explain.
To initiate a nuclear reaction, an experimental nuclear physicist wants to shoot a proton into a 5.50-fm-diameter 12C nucleus. The proton must impact the nucleus with a kinetic energy of 3.00 MeV. Assume the nucleus remains at rest.
a. With what speed must the proton be fired toward the target?
b. Through what potential difference must the proton be accelerated from rest to acquire this speed?
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