chemistry - Chapter 7 Atomic Structure Page 1 Chapter 7...

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Chapter 7 — Atomic Structure Page 1 Chapter 7 ATOMIC STRUCTURE USEFUL CONSTANTS: 1 nm = 1.0 x 10 -9 m velocity of light = 3.0 x 10 8 m/s h = Planck's constant = 6.6261 x 10 -34 J • s 7-1. If the frequency is observed to be 1.00 x 10 12 Hz for a microwave signal, what is the wavelength of this radiation in centimeters? (1 Hz = 1 cycle per second) (a) 3.00 x 10 -4 cm (b) 3.00 x 10 -2 cm (c) 3.34 cm (d) 3340 cm 7-2. If red light has a frequency of 4.28 x 10 14 Hz, what is the wavelength of this light? (a) 0.650 nm (b) 2.10 nm (c) 65.0 nm (d) 700 nm 7-3. A local radio station has a frequency of 98.6 megahertz (MHz). What is the wavelength of this station in centimeters? (1 MHz = 1.00 x 10 6 cycles per second) (a) 304 cm (b) 37.1 cm (c) 0.329 cm (d) 0.00289 cm 7-4. Which of the following produces radiation having the highest frequency? (a) microwave oven (b) AM radio (c) radar (d) FM radio 7-5. Which of the following types of radiation has the longest wavelength? (a) gamma rays (b) visible (c) ultraviolet (d) radar 7-6. Which of the following has the longest wavelength? (a) blue light (b) red light (c) yellow light (d) green light Revised: November 1997
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Chapter 7 — Atomic Structure Page 2 7-7. Which of the following types of radiation has the highest energy? (a) gamma rays (b) visible (c) ultraviolet (d) radar 7-8. What is the frequency of green light having a wavelength of 521 nanometers? (a) 5.21 x 10 7 Hz (b) 5.75 x 10 7 Hz (c) 5.75 x 10 11 Hz (d) 5.75 x 10 14 Hz 7-9. What is the frequency in megahertz of a radio station that broadcasts at a wavelength of 325 centimeters? (1 MHz = 1.00 x 10 6 cycles per second) (a) 22.1 MHz (b) 67.1 MHz (c) 92.2 MHz (d) 108 MHz 7-10. What is the frequency in megahertz of a radio set that is broadcasting at 99.9 meters? (a) 3.00 MHz (b) 15.7 MHz (c) 33.3 MHz (d) 299 MHz 7-11. In the Rutherford scattering experiment, Rutherford bombarded a thin piece of gold foil with a beam of (a) electrons (b) neutrons (c) protons (d) alpha rays 7-12. In the Rutherford scattering experiment, what did Rutherford observe to happen to the beam of particles that bombarded the thin piece of gold foil? (a) None of the particles were deflected. (b) Only a few particles were deflected, but the deflection was large. (c) Most of the particles were slightly deflected. (d) Most of the particles were greatly deflected. 7-13. Based on these observations from the scattering experiment, what did Rutherford conclude? (a) The positive part of the atoms is moving very rapidly. (b) The positive charge is distributed throughout the atom. (c) The positive part of the atom is relatively small and heavy. (d) The negative part of the atom is relatively small and heavy. Revised: November 1997
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Chapter 7 — Atomic Structure Page 3 7-14. According to the experiments concerned with the photoelectric effect, what was the result of increasing the intensity of the light striking the metal surface?
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