The observable ________ is a thin layer of the Sun in which the solar material becomes suddenly much more opaque as we look deeper into the Sun
Fill in the blank(s) with correct word
photosphere
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The second postulate of special relativity states that ____
a. observers cannot detect their uniform motion except relative to other objects b. observers cannot distinguish locally between inertial forces and uniform gravitational forces due to acceleration and the presence of a massive body c. the laws of physics are the same for all observers regardless of their motion as long as their speed is constant d. the speed of light is constant and will be the same for all observers independent of their motion relative to the light source e. the acceleration of an object is proportional to the applied force and inversely proportional to its mass
Current: A electric heater that draws 13.5 A of dc current has been left on for 10 min. How many electrons that have passed through the heater during that time? (e = 1.60 × 10-19 C)
A. 1.5 × 1022 B. 5.1 × 1022 C. 1.8 × 103 D. 8.1 × 103 E. 1.0 × 1023
If Earth's atmosphere had no greenhouse gases, then Earth's average surface temperature would be
A) well below the freezing point of water. B) about the same as it is now. C) slightly cooler, but still above freezing. D) slightly warmer, but still well below the boiling point of water.
Which of the following statements about electrons is not true?
A) Electrons orbit the nucleus rather like planets orbiting the Sun. B) Within an atom, an electron can have only particular energies. C) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels. D) An electron has a negative electrical charge. E) Electrons have very little mass compared to protons or neutrons.