Which of the following methods has been the LEAST successful in detecting extrasolar planets around other star systems?
A) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky
B) detection of Doppler shifts in the spectra of the parent stars
C) detection of brightness changes in a star as a planet passes in front of it
D) detection of reflected starlight
A
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If we accelerate a radioactive isotope of an element in a particle accelerator to a speed close to that of light, what would its observed rate of decay be compared to its rate of decay at rest?
A) faster B) slower C) infinite D) zero
If a power plant is 30% efficient, and the transmission system that delivers power to consumers is 60% efficient, then the overall efficiency is
A) 90%. B) 60%. C) 30%. D) 18%. E) none of the above
Why has Mercury traditionally been such a hard planet to observe and study?
What will be an ideal response?
__________ is the collective name given for particles that interact via the strong force
Fill in the blank(s) with correct word