A physics student misspoke when he gave a presentation. He stated that the total energy of a substance is best demonstrated by its temperature. It would have been most correct for him to say that A. the total energy is demonstrated by the substance's specific heat.

B. the average kinetic energy is demonstrated by the substance's thermal energy.

C. the total kinetic energy is demonstrated by the substance's thermal energy.

D. the mass determines the substance's average kinetic energy.

Scientists use laser range-finding to measure the distance to the moon with great accuracy. a brief laser pulse is fired at the moon, then the time interval is measured until the "echo" is seen by a telescope. a laser beam spreads out as it travels because it diffracts through a circular exit as it leaves the laser. in order for the reflected light to be bright enough to detect, the laser spot on the moon must be no more than 1.0 km in diameter. staying within this diameter is accomplished by using a special large-diameter laser. part a if λ = 540nm , what is the minimum diameter of the circular opening from which the laser beam emerges? the earth-moon distance is 384,000 km. express your answer to two significant figures and include the appropriate units.

Iron is a transition metal with multiple oxidation numbers. (answer the following) a. what is the iron (ii) ion? how does it differ from the iron (iii) ion? b. if iron were to bond with oxygen, predict the formula for each oxidation number of iron. c. how would each formula be named?

Heterogeneous mixture with larger particles that never settle is