What is the basic explanation for the origin of electromagnetic waves?
The acceleration of an electrically charged particle (electron, proton, or ion) will
release energy that spreads outward as electromagnetic waves.
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Spherical Mirrors: Suppose you place an object in front of a concave mirror. Which of the following statements must be true? (There could be more than one correct choice.)
A. The image of the object will always be smaller than the object. B. No matter where you place the object, a real image of the object will be formed. C. The image of the object will always be inverted. D. If you position the object between the mirror and the focal point of the mirror, its image must be upright and virtual. E. No matter where you place the object, the image of the object will always be virtual and upright.
A star's ________ parallax is found by using the spectral lines to estimate the spectral class and luminosity of distant stars
Fill in the blank(s) with correct word
A galvanometer has an internal resistance of 100 ? and deflects full-scale at 2.00 mA. What size resistor should be added to the galvanometer to convert it to a milliammeter capable of reading up to 4.00 mA,
and how should this resistor be connected to the galvanometer? A) 50.0 ? in series with the galvanometer B) 50.0 ? in parallel with the galvanometer C) 75.0 ? in parallel with the galvanometer D) 100 ? in parallel with the galvanometer E) 100 ? in series with the galvanometer
Suppose you start at Washington, D.C. (39°N, 77°W), and travel 400 nautical miles due south, then 400 nautical miles due east, then 400 nautical miles due north, and then 400 nautical miles due west. Where will you arrive with respect to Washington, D.C.? That is will you be at the starting point, or north, south, east, or west of the starting point?