A photon is
A) a high-energy electromagnetic wave.
B) an electron that has been ejected from a metal surface by electromagnetic radiation.
C) a particle-like quantum of radiation.
D) one of the two types of nuclear particles.
E) the anti-particle to the electron.
Question 2
A certain siren radiates sound uniformly in all directions. At a distance of 17 m from the siren, the intensity level is 49 db. How many watts of power does this siren put out? The threshold of human hearing is 1.0 10-12 W/m2.
What will be an ideal response?
Examples of energy
A very high-resolution texture of the planet Mars
Scorpions, Spiders and Sharks: Electron-Microscope Images
Kinetic versus Potential Energy
The energy budget
The level of emissions from transport in the United States is twice as high as the global average