Suppose you are standing at rest as you watch a train approach you with a whistle that has a frequency of 1600 Hz. Describe the pitch or pitches you hear as the train approaches, passes in front of you, and travels away from you. above 1600 Hz as it approaches you; 1600 Hz as it passes by you; above 1600 Hz as it moves away from you

above 1600 Hz as it approaches you; 1600 Hz as it passes by you; below 1600 Hz as it moves away from you

1600 Hz as it approaches you; 1600 Hz as it passes by you; below 1600 Hz as it moves away from you

below 1600 Hz as it approaches you; 1600 Hz as it passes by you; above 1600 Hz as it moves away from you

Astudent looks at ocean waves coming into the beach. an ocean wave with more energy will a) have a greater height. b) have a greater period. c) travel toward the beach faster. d) strike the beach with greater frequency.

Some material consisting of a collection of microscopic objects is kept at a high temperature. a photon detector capable of detecting photon energies from infrared through ultraviolet observes photons emitted with energies of 0.3 ev, 0.5 ev, 0.8 ev, 2.0ev, 2.5ev, and 2.8ev. these are the only photon energies observed. (a) draw and label a possible energy-level diagram for one of the microscopic objects, which has four bound states. on the diagram, indicate the transitions corresponding to the emitted photons. explain briefly. (b) would a spring–mass model be a good model for these microscopic objects? why or why not? (c) the material is now cooled down to a very low temperature, and the photon detector stops detecting photon emissions. next, a beam of light with a continuous range of energies from infrared through ultraviolet shines on the material, and the photon detector observes the beam of light after it passes through the material. what photon energies in this beam of light are observed to be significantly reduced in intensity (“dark absorption lines”)? explain briefly.

Astone weighing 1.5 kilograms is resting on a rock at a height of 20 meters above the ground. the stone rolls down 10 meters and comes to rest on a patch of moss. the gravitational potential energy of the stone on the moss is joules.