Estimate how many pennies you would have to stack to reach from the floor to an average 8-ft ceiling
A) 2 × 103
B) 2 × 102
C) 2 × 104
D) 2 × 105
E) 2 x 106
A
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Answer the following statement(s) true (T) or false (F)
The work function W for copper is 4.65 eV. Visible light will dislodge electrons from a copper surface
An atom of the element iron has an atomic number of 26 and an atomic weight of 56. If it is neutral, how many protons, neutrons, and electrons does it have?
A) 26 protons, 30 neutrons, 26 electrons B) 26 protons, 30 neutrons, 30 electrons C) 26 protons, 56 neutrons, 26 electrons D) 13 protons, 43 neutrons, 13 electrons E) 13 protons, 56 neutrons, 13 electrons
A convex mirror has a focal length of ?20 cm. What is the position of the resulting image (in cm) if the image is upright and four times smaller than the object?
a. ?100 b. ?25 c. ?50 d. ?15 e. ?10
This illustration shows the orbits of the three satellites that will compose the Laser Interferometer Space Antenna (LISA). What gravitational wave frequencies will LISA be sensitive to?
a. 0.0001 to 1 hertz to observe gravitational waves from binary systems and black holes. b. 1 to 10 hertz to observe gravitational waves from binary systems and black holes. c. 10 to 1000 hertz to observe gravitational waves from supernovae. d. 0.0001 Hertz to 1 hertz to observe gravitational waves of planets moving around stars. e. 0.0001 Hertz to 1 hertz to observe gravitational waves of moons moving around planets.