Beta particles
A. have no charge
B. are the same as electrons
C. are the same as helium ions
B. are the same as electrons
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Photoelectric Effect: When the surface of a metal is exposed to blue light, electrons are emitted. If the intensity of the blue light is increased, which of the following things will also increase?
A. the number of electrons ejected per second B. the maximum kinetic energy of the ejected electrons C. the time lag between the onset of the absorption of light and the ejection of electrons D. the work function of the metal E. All of these
State Kepler's three laws of planetary motion
What will be an ideal response?
Energy in Capacitors: Measurements show that it takes 0.30 mJ of work to move 5.0-?C of charge from one plate to another of a certain air-filled capacitor while the potential difference between these plates is kept constant. What is the potential difference between the plates of this capacitor?
A. 60 V B. 81 V C. 55 V D. 23 V E. 0 V
This diagram shows the approximate depths to which different wavelengths of light penetrate Earth's atmosphere. Why does it show an airplane?
A) Much of the infrared spectrum can be observed from an airplane that flies above most clouds. B) Airplanes are useful for astronomical observations at all wavelengths of light that do not reach the ground. C) Telescopes on airplanes are better than telescopes on the ground for both visible-light and infrared observations. D) The airplane is just decorative, indicating that astronomers use airplanes to fly to ground-based observatories.