Calculate the energy En, in electron volts, of a hydrogen atom's electron with n = 6


-0.378 eV

Physics & Space Science

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Rotational Dynamics: The rotating systems shown in the figure differ only in that the two identical movable masses are positioned a distance r from the axis of rotation (left), or a distance r/2 from the axis of rotation (right). If you release the hanging blocks simultaneously from rest, and call tL the time taken by the block on the left and tR the time taken by the block on the right to reach the bottom, respectively, then

A. tL > tR. B. tL = tR. C. tL < tR.

Physics & Space Science

What is one piece of evidence for dark matter?

A. the existence of many dark cool dust clouds that do not emit radiation B. the presence of neutrinos C. the existence of many planetary systems D. the fact that the rotation curves of most galaxies become flat at large distances from the center

Physics & Space Science

In a certain region, the electric potential due to a charge distribution is given by the equation V(x,y) = 2xy - x2 - y, where x and y are measured in meters and V is in volts. At which point is the electric field equal to zero?

A) x = 0.5 m, y = 1 m B) x = 1 m, y = 1 m C) x = 1 m, y = 0.5 m D) x = 0.5 m, y = 0.5 m E) x = 0 m, y = 0 m

Physics & Space Science

A Hooke's law spring is compressed a distance d and is used to launch a mass m vertically to a height h above its starting position. Under double the compression, the spring is now used to launch the mass. How high does the mass now rise above its starting position?

a. 2h c. 3h b. 1.41h d. 4h

Physics & Space Science