If a monochromatic light beam with quantum energy value of 1.6 eV incident upon a photocell where the work function of the target metal is 0.9 eV, what is the maximum kinetic energy of ejected electrons?
a. 2.5 eV
b. 1.8 eV
c. 0.7 eV
d. 3.2 eV
e. 1.3 eV
c
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In the condensation theory of the Moon's origin,
a. the Moon broke from a rapidly spinning Earth. b. Earth and its Moon formed from the same cloud of matter. c. the Moon formed elsewhere in the solar nebula and was later captured by Earth. d. the Moon formed when a very massive planetesimal smashed into the young Earth.
The graph shows how a star's orbital speed varies with time because of the gravitational tug of an orbiting planet. These data were obtained by measuring
A) the precise wavelengths of spectral lines in the spectrum of the star. B) the precise wavelengths of spectral lines in the spectrum of the orbiting planet. C) the precise brightness of the star divided by the precise brightness of the planet. D) the orbital period of the planet that is orbiting the star.
During which step in cosmic evolution were the chemical bases for life created?
A) particulate evolution B) stellar evolution C) chemical evolution D) biological evolution E) cultural evolution
Four point charges are located at the corners of a square, 1.00 m by 1.00 m. On each of two diagonally opposite corners are 1.00 ?C charges. On each of the other two corners are - 1.00 ?C charges. What is the magnitude of the force on one of the positive charges?
a. 
b. 
c. 
d. 
e. 0.00