Contrast apparent and absolute magnitudes
What will be an ideal response?
The apparent magnitude is how bright it appears to us from Earth, and is determined by both the star's luminosity and distance. But with absolute magnitudes, we negate the distance factor by calculating how bright all the stars would be at a common distance of ten parsecs; this allows us to make direct comparisons of stellar luminosities.
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Assuming that light could curve around Earth, about how long would it take for one trip?
A. 1 second B. 1/7 second C. 7 minutes D. 7 seconds
A capacitor C1 = 11.8 ?F is connected in parallel with a capacitor C2 = 5.4 ?F, and a potential difference of 166 V is applied across the pair. What is the equivalent capacitance of the pair?
Impedance: The impedance of an RC circuit containing a 40.0-?F capacitor is 800 ?. If the frequency of the applied ac voltage is 18.0 Hz, what is the resistance of the resistor?
A. 569 ? B. 669 ? C. 769 ? D. 869 ? E. 800 ?
An electron has a wavelength of 0.123 nm. What is its energy in eV?
A) 80. keV B) 20. keV C) 40. keV D) 10. keV E) 60. keV