It is desired to conduct a diffraction experiment with neutrons of a wavelength of 0.1 nm. What is the kinetic energy of these neutrons in both joules and electron-volts?
What will be an ideal response?
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Suppose you wanted to start a fire using a mirror to focus sunlight. Which of the following statements is most accurate?
A) It would be best to use a concave mirror, with the object to be ignited positioned at the center of curvature of the mirror. B) It would be best to use a concave mirror, with the object to be ignited positioned halfway between the mirror and its center of curvature. C) It would be best to use a convex mirror. D) It would be best to use a plane mirror. E) One cannot start a fire using a mirror, since mirrors form only virtual images.
You live at a latitude of 39° S. What is the angle between the southern horizon and the south celestial pole?
a. 45° b. 23.4° c. 39° d. 51° e. The answer depends on the day of the year.
A hockey puck traveling at speed v on essentially frictionless ice collides with one end of a straight stick lying flat on the ice and sticks to that end. In this collision
A. momentum is conserved. B. angular momentum is conserved. C. energy is conserved. D. all of the above are conserved. E. only momentum and angular momentum are conserved.
Two objects move toward each other due to gravity. As the objects get closer and closer, the acceleration of each
A) increases. B) decreases. C) is not affected.