What is –25°F in kelvin?
a. 241.48 K
b. 259.26 K
c. 228.15 K
d. 286.89 K
a
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If a star's spectrum does not contain spectral lines characteristic of a certain element, can we conclude that the star does not contain that element? Why or why not?
What will be an ideal response?
Which of the following is a megawatt?
A) 109W B) 106W C) 1000 W D) 10-9W E) 10-6W
Two mirrors are joined together along a common side, the planes of the mirrors separated by the angle ? . If the joined mirrors can be used as a retroreflector when a beam of light strikes both surfaces (one after the other), what is the value of ??
a. 30° b. 45° c. 90° d. 135°
The tropical year is
a) longer than the sidereal year. b) shorter than the sidereal year. c) equal to the sidereal year. d) measured with reference to the autumnal equinox.