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Chapter 37: Q.8 (page 1081)
The current in a Crookes tube is . How many electrons strike the face of the glass tube each second?
Number of electrons striking the surface are.
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Identify the element, the isotope, and the charge state of each atom in FIGURE . Give your answer in symbolic form, such as 4He+ or 8Be-.
Write the symbol for an atom or ion with:
a. five electrons, five protons, and six neutrons.
b. five electrons, six protons, and eight neutrons.
A ceramic cube on each side radiates heat at . At what wavelength, in , does its emission spectrum peak? Assume.
Explain why the observation of alpha particles scattered at very large angles led Rutherford to reject Thomson’s model of the atom and to propose a nuclear model.
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?
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