A standing wave is set up in a 100-cm string fixed at both ends. The string vibrates in 5 distinct segments when driven by a 120-Hz source. What is the wavelength?
a. 10 cm
c. 40 cm
b. 20 cm
d. 80 cm
C
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A fixed container holds oxygen and helium gases at the same temperature. Which of the following statements are correct? (There could be more than one correct choice.)
A) The oxygen molecules have the greater speed. B) The helium molecules have the same average kinetic as the oxygen molecules. C) The helium molecules have the greater speed. D) The helium molecules have the greater average kinetic energy. E) The oxygen molecules have the greater average kinetic energy.
Terminal Voltage and Internal Resistance: You buy a AA battery in the store, and it is marked 1.5 V. If this marking is strictly accurate, while this battery is fresh
A. its terminal voltage will be more than 1.5 V when it is used in a circuit. B. its terminal voltage will be less than 1.5 V when it is used in a circuit. C. its terminal voltage will be 1.5 V when it is used in a circuit.
Different colors of light travel at different speeds in a transparent medium. In a vacuum, different colors of light travel at
A) different speeds. B) the same speed. C) decreased speed.
Which of the following is not evidence for plate tectonics on Earth?
A) Some continental boundaries fit together like pieces of a jigsaw puzzle. B) Similar rocks and fossils are found in different continents. C) high ocean ridges between the continents D) the existence of volcanoes E) earthquakes