What is the energy of a single photon of infrared light with a wavelength of 1.00 µm? 1 µm = 10^-6m

A): 4.29 x 10^-20 J
B): 4.98 x 10^-19 J
C): 1.98 x 10^-19 J
D): 5.05 x 10^18 J

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?

Only 3% of the water on earth is usable by humans. even though that 3% is through the water cycle, we still need to be careful not to waste water.

Which of the following is used to answer scientific question? a. intuitionb. opinion pollsc. experimentd. imagination