To an observer on Earth, dust in the interstellar medium will cause a star to appear_______________ and_______________than it really is
Fill in the blank(s) with correct word
fainter; cooler
cooler; fainter
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Why does the Moon glow coppery red during a total lunar eclipse?
What will be an ideal response?
Ripples in the Cosmic Microwave Background correspond to
A) matter density fluctuations. B) temperature fluctuations. C) energy fluctuations. D) fluctuations in both matter and radiation. E) imperfections in measurement techniques or equipment.
Water at room temperature, 20°C, is pumped into a reactor core where it is converted to steam at 200°C. How much heat (in J) is transferred to each kilogram of water in this process? (csteam = 2 010 J/kg×°C; Lsteam = 2.26 × 10^3 J/g; 1 cal = 4.186 J.)
a. 3.35 × 10^5 b. 7.53 × 10^5 c. 2.67 × 10^6 d. 2.80 × 10^6 e. 3.01 × 10^6
As a train starts from rest and then accelerates down the track, coming toward me faster and faster, the speed of the sound waves coming toward me will be
a. slower than the normal speed of sound in air. b. equal to the normal speed of sound in air. c. some constant speed faster than the normal speed of sound in air. d. faster and faster.