The luminosity of a star is determined by the star's ________ and ________.

A. diameter; surface temperature
B. apparent brightness; surface temperature
C. brightness; temperature
D. distance; surface temperature
E. diameter; distance


Answer: A

Physics & Space Science

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A particle (mass = 6.7 × 10^?27 kg, charge = 3.2 × 10^?19 C) moves along the positive x axis with a speed of 4.8 × 10^5 m/s. It enters a region of uniform electric field parallel to its motion and comes to rest after moving 2.0 m into the field. What is the magnitude of the electric field?

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