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Chapter 37: The Foundations of Modern Physics

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Pages: 1063 - 1084

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130 Questions for Chapter 37: The Foundations of Modern Physics

  1. 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

    Found on Page 1081
  2. An electron in a cathode-ray beam passes between 2.5cm-long parallel-plate electrodes that are 5.0mm apart. A 2.0mT, 2.5-cm-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

    Found on Page 1082
  3. An alpha particle (a bare helium nucleus with q=+2e) accelerates across a 100 V 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 he

    Found on Page 1081
  4. An oil droplet with 15excess electrons is observed between two parallel electrodes spaced 12mm apart. The droplet hangs motionless if the upper electrode is25V more positive than the lower electrode. The density of the oil is 860kg/m3. What is

    Found on Page 1082
  5. Suppose that in a hypothetical oil-drop experiment you measure the following values for the charges on the drops:3.99×10-19C,6.65×10-19C,2.66×10-19C, 10.64×10-19C, and9.31×10-19C. What is the largest value of the fundamental unit of charge that is consistent

    Found on Page 1082
  6. Figure 37.7 identified the wavelengths of four lines in the Balmer series of hydrogen.

    Found on Page 1081
  7. What temperature, in °C, is a blackbody whose emission spectrum peaks at (a)300nm and (b)3.00mm?

    Found on Page 1081
  8. A ceramic cube 3.0cm on each side radiates heat at 630W. At what wavelength, in mm, does its emission spectrum peak? Assumee=1

    Found on Page 1081
  9. The wavelengths in the hydrogen spectrum with m=1form a series of spectral lines called the Lyman series. Calculate the wavelengths of the first four members of the Lyman series.

    Found on Page 1081
  10. A newspaper delivery boy is riding his bicycle down the street at 5.0 m/s. He can throw a paper at a speed of 8.0 m/s. What is the paper’s speed relative to the ground if he throws the paper (a) forward, (b) backward, and (c) to the side?

    Found on Page 1081

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