Electromagnetic radiation with a wavelength of 641 nm appears as orange light to the human eye. the energy of one photon of this light is 3.10 × 10−19 j. thus, a laser that emits 1.3×10−2 j of energy in a pulse of light at this wavelength produces photons in each pulse.

The crank oa rotates in the vertical plane with a constant clockwise angular velocity ω0 of 5.6 rad/s. for the position where oa is horizontal, calculate the force under the light roller b of the 10.6-kg slender bar ab.

The speed of sound in ice, water, and steam is shown. what best explains the speed of sound in different states of matter? sound travels fastest in ice because energy is easier to transfer when the molecules are close together. sound travels slowest in steam because the sound has to move around the gas molecules that are far apart. sound travels fastest in ice because the temperature of solids is always greater, so the heat transfers the sound energy. sound travels slowest in steam because the pressure is so great the sound cannot travel though the steam particles.

At what time will the interfering waves have an amplitudeof zero?