A hydrogen atom emits a photon as it makes a transition from the n = 4 state to the n = 3 state. The energies of these two states are –0.9 eV and –1.5 eV, respectively. (a) What is the energy of the photon? (b) What is its frequency?
(a) 0.6 eV, (b) 1.5 × 10^14 Hz
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A 20.0-kg traffic light hangs midway on a cable between two poles 30.0 meters apart. If the sag in the cable is 0.40 meters, what is the tension in each side of the cable?
a. 9.8E+1 N b. 9.8E+3 N c. 3.7E+3 N d. 3.8E+2 N e. 2.0E+4 N
The lower edge of the main-sequence band is known as ________ and represents the location in the H-R diagram at which stars begin their lives as main-sequence stars
a. the Coulomb barrier b. hydrostatic equilibrium c. the birth line d. the zero-age main sequence e. the evolutionary track
A satellite is in a low circular orbit about the Earth (i.e., it just skims the surface of the Earth). How long does it take to make one revolution around the Earth?
What will be an ideal response?
How can you determine the distance to a spacecraft from the time it takes its radio signal to reach Earth?
What will be an ideal response?