What two observable properties of a Cepheid variable are directly related to one another?
A) its luminosity and its mass
B) the period between its peaks of brightness and its distance
C) the period between its peaks of brightness and its luminosity
D) its mass and its distance
C
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Radiation: A sphere of surface area 1.25 m2 and emissivity 1.0 is at a temperature of 100°C. At what rate does it radiate heat into empty space? (? = 5.67 × 10-8 W/m2 ? K4)
A. 7.1 W B. 0.71 mW C. 1.4 kW D. 9.9 mW E. 3.7 W
The utilities always follow the practice of retiring fossil fuel electric generating plants at the end of their original lifetimes
What will be an ideal response?
What is the magnification of a magnifying glass of focal length 4.0 cm if the image is to be viewed by a relaxed eye with a near point of 25 cm?
A) 2.0 B) 3.0 C) 3.6 D) 4.0 E) 6.3
Young open clusters contain a lot of hot, young blue-white stars
Indicate whether the statement is true or false