Which of the following methods has been the MOST 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 brightness changes in a star as a planet passes in front of it
C) detection of Doppler shifts in the spectra of the parent stars
D) detection of reflected starlight
B
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Of the planets with atmospheres, which is the warmest?
a. Venus b. Earth c. Mars d. Jupiter
The heavy bombardment phase of the solar system lasted
A) several million years. B) several tens of millions of years. C) several hundreds of millions of years. D) about a billion years. E) to the present time.
The Bohr model pictures a hydrogen atom in its ground state as a proton and an electron separated by the distance a0 = 0.529 × 10^?10 m. The electric potential created by the electron at the position of the proton is
a. ?13.6 V. b. +13.6 V. c. ?27.2 V. d. +27.2 V. e. +5.12 × 10^9 V.
A glass plate 2.5 cm long is separated from another glass plate by a strand of someone's hair (diameter 0.010 mm). How far apart are the adjacent interference bands when viewed with light of wavelength 600 nm?
What will be an ideal response?