The ________ spacecraft, launched in 2009, has already found hundreds of exoplanet candidates
Fill in the blank(s) with correct word
Kepler
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Objects that subtend a larger angle in the eye
A. Are perceived to be smaller B. Are perceived to be larger C. The subtended angle has no effect on perception D. Are farther way
The composition of a planet's atmosphere be measured during a transit by analyzing
A) the excess absorption of starlight at specific wavelengths. B) the excess emission of starlight at specific wavelengths. C) the length and depth of the dip in light during the transit. D) the amplitude and period of the star's motion. E) the wobble in a star's position on the sky.
Regarding the charges of the electron, proton and neutron:
A) these objects are charged only when they reside in an ionized atom; otherwise, all three are uncharged. B) the proton has a positive charge, the electron has a much smaller negative charge, and the neutron has no charge. C) the proton has a positive charge, the neutron has a negative charge whose strength is equal to that of the proton's charge, and the electron has no charge. D) the electron has a negative charge, the proton has a positive charge, and the neutron has a charge that can be positive or negative or zero depending on the ionization of the atom in which it resides. E) the proton has a positive charge, the electron has a negative charge whose strength is equal to the strength of the proton's charge, and the neutron has no charge.
The intensity level of sound 30 m from a jet airliner is 120 dB. At what distance from the airplane will the sound intensity level be a tolerable 100 dB? (Assume spherical spreading of sound.)
a. 60 m c. 300 m b. 90 m d. 400 m