If a substance is radioactive it is definitely
a. dangerous
b. emitting alpha particles
c. glowing
d. useful
e. all of the above
f. none of the above
Indicate whether the statement is true or false
F
Some choices are possible in certain cases but not in all cases.
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When most substances are heated, molecules inside move faster and take up more space, resulting in thermal
A) bending. B) expansion. C) contraction. D) heat.
How will TESS build upon the Kepler mission?
A) It will zoom in on the best planet candidates and allow us to confirm whether or not they are actually planets. B) It will use the same strategy but will cover the whole sky. C) It will allow us to detect extrasolar planets from the Southern hemisphere instead of just the Northern hemisphere. D) It will allow us to observe in a different wavelength.
Assuming a pupil diameter of 3. mm, what is the angular resolution of the human eye at the middle of the visible spectrum (550. nm)?
A) 0.8 degree B) 0.8 arc-minute C) 0.2 degree D) 0.2 arc-minute E) 2. milliradian
Life emerged on Earth within about a billion years after the solar system formed
Indicate whether the statement is true or false