The figure shows the displacement y of a traveling wave at a given position as a function of time and the displacement of the same wave at a given time as a function of position. How fast is the wave traveling?

One way to probe the rate of nuclear reactions in the center of the Sun is by studying ________ produced because ________.

A. neutrinos; they pass out of the Sun without undergoing a random walk B. positrons; they annihilate into gamma rays of very specific energies C. wave motions; they can be measured at the Sun's surface D. heavy hydrogen; it has different spectral lines than normal hydrogen

Which of the following charge distributions has the lowest electric potential at the origin? int

Which is the first postulate of Bohr's model of the atom?

a. The angular momentum of the electron is quantized. b. Light is quantized. c. An electron radiates while it remains in an allowed orbit. d. An electron is not in a precise orbit. e. A photon is emitted whenever an electron jumps up one orbit.

Suppose a uniform electric field of 4 N/C is in the positive x direction. When a charge is placed at and fixed to the origin, the resulting electric field on the x axis at x = 2 m becomes zero. What is the magnitude of the electric field at x = 4 m on the x axis at this time?

a. 0 b. 1 N/C c. 2 N/C d. 4 N/C e. More information is needed to find the resulting field magnitude at this position.