Which of the following is not a reason fluorescent lamps are advantageous over incandescent lamps? a. fluorescent lamps operate at a higher temperature than incandescent lamps. b. fluorescent lamps are more efficient than incandescent lamps. c. fluorescent lamps produce light with less glare than incandescent lamps. d. fluorescent lamps dissipate more energy as light instead of heat than incandescent lamps. ( penn foster exam )

Atrain is traveling at 30.0 m/s relative to the ground in still air. the frequency of the note emitted by the train whistle is 262 hz. the speed of sound in air should be taken as 344 m/s. what frequency (f approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? what frequency (f recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?