Atrain at rest emits a sound at a frequency of 1045 hz. an observer in a car travels away from the sound source at a speed of 22.4 m/s. what is the frequency heard by the observer? assume the speed of sound in air to be 344 m/s. answer in units of hz

Match the atomic particles with their characteristics. 1. made of two protons and two neutrons neutron 2. similar to an electron; positive charge neutrino 3. orbits nucleus; negative charge positron 4. bundle of energy; zero charge proton 5. found in nucleus; positive charge meson 6. very unstable; +, -, or zero charge gamma 7. found in nucleus; zero charge electron 8. negative particle; negative charge beta 9. atomic energy converted to mass alpha

Immediately upon reaching its lowest point, a falling pendulum bob has its greatest amount of energy, which is the initial amount of potential energy. a. heat; less than b. heat; more than c. kinetic; less than d. kinetic; more than

More solar radiation is absorbed by earth’s surface than by