What type of exoplanet observation allows unambiguous determination of the exoplanet's mass and radius? Can this be done with most exoplanets?
What will be an ideal response?
Only planetary transits allow unambiguous determination of exoplanets' mass and radius. As this requires the system to be seen edge-on, such determinations are rare.
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If the plates of a charged parallel plate capacitor were moved further apart, while the charge on the plates is kept constant, the potential energy of each of the charges on the capacitor would
A. increase or decrease depending on the initial plate separation. B. decrease. C. increase. D. remain the same.
A 1 000-kg sports car accelerates from zero to 25 m/s in 7.0 s. What is the average power delivered by the automobile engine?
a. 8.9E+4 W b. 1.8E+3 W c. 4.5E+4 W d. 1.8E+5 W e. 5.4E+4 W
Ellis and Randy are looking at a molecular absorption spectrum. The spectral lines appear to fall into two groups with a gap in the middle. Ellis says that this must be an absorption spectrum for transitions between the v = 0 and v = 1 vibrational states of a diatomic molecule. Randy says the gap in the middle must occur because a ?J = 0 transition is forbidden. Which one, if either, is correct,
and why? a. Ellis, because rotational levels are separated by greater energy differences than vibrational levels. b. Randy, because rotational levels are separated by greater energy differences than vibrational levels. c. Ellis, because the ?J = 0 transition is the most prominent spectral line in transitions between vibrational levels. d. Neither, because rotational levels are separated by greater energies that vibrational levels and ?J = 0 transitions are not forbidden. e. Both, because vibrational levels are separated by greater energy differences than rotational levels and ?J = 0 transitions are forbidden.
An atom with fewer electrons than protons is a negative ion
Indicate whether the statement is true or false