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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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.
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