Light with a wavelength of 310 nm is incident on a metal that has a work function of 3.8 eV. What is the maximum kinetic energy that a photoelectron ejected in this process can have?
A) 0.62 × 10-19 J
B) 0.21 × 10-19 J
C) 0.36 × 10-19 J
D) 0.48 × 10-19 J
E) 0.33 × 10-19 J
E
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The mass of a supermassive black hole thought to power a quasar is typically
A) 3 solar masses. B) 10 solar masses. C) 1 trillion solar masses. D) 1 billion solar masses.
Galaxy A receding from Galaxy B at a velocity of 75000 km/s, from the perspective of Galaxy B. Hubble's Law says that V=H0 x D. About how far is Galaxy A from Galaxy B? Use a value of 75 km/s/Mpc for Hubble's constant.
A. 50000 Mpc B. 100 Mpc C. 500,000 Mpc D. 5000 Mpc E. 1000 Mpc
Inside the nucleus, the weakest of the four fundamental forces is
A) the electromagnetic force. B) the gravitational force. C) the weak nuclear force. D) the strong nuclear force.
When fans do "the wave" at a sports stadium, it is a ________ (transverse or longitudinal) wave.
Fill in the blank(s) with the appropriate word(s).