Which of the following best describes the image for a thin, concave lens that forms whenever the magnitude of the object distance is less than that of the lens's focal length?
a. inverted, diminished, and real
c. inverted, enlarged, and real
b. upright, diminished, and virtual
d. upright, enlarged, and virtual
B
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What information does a star's Greek-letter designation convey?
What will be an ideal response?
All of the following hypothetical planets orbit a star with the same mass as the Sun (one solar mass)
Which one has the shortest orbital period? (If two objects would have the same orbital period to within a difference of less than 1% consider them as having identical periods.) A) Planet A: one Earth mass and 1 AU from the star B) Planet B: two Earth masses and 1 AU from the star C) Planet C: two Earth masses and 2 AU from the star D) Planets A and B E) Planets B and C F) All of them have the same period.
The universe is made mostly of
A) dark energy. B) dark matter. C) neutrinos. D) pizza. E) ordinary matter.
What is binding energy, and what physical effect causes it?
What will be an ideal response?