Classical theory tells us that each degree of freedom associated with an oscillator in a black- body should have energy e kt. quantum theory tells us this can be wrong if it requires that kt be smaller than the universal quantum of energy e - hv. classical theory also tells us that the energy emitted by a blackbody increases exponentially with frequency according to the rayleigh-jeans law. instead we measure, and can derive from quantum theory, the planck function: the planck function has the long tail of the rayleigh-jeans law at low fre quencies, but unlike the rayleigh-jeans law, a sudden drop-off at high frequencies. show that the wavelength where this drop-off starts to occur (i. e. near where there is a maximum in the planck function) is roughly where classical theory would (impossibly) require kt < hv. it may to consider wien's law and look at a planck function curve for guidance. con- sider two cases, the temperature of the sun (t = 6000 k), and the temperature of the earth (t = 300 k). keep in mind you aren't required to explicitly solve the planck function. your answer shouldn't be very long.

Determine the amount of work done when a crane lifts a 100-n block form 2m above the ground to 6m above the ground

Need asap ! what is the relationship between atmospheric pressure and the density of gas particles in an area of increasing pressure? (2 points) as air pressure in an area increases, the density of the gas particles in that area decreases. as air pressure in an area increases, the density of the gas particles in that area increases. as air pressure in an area increases, the density of the gas particles in that area remains constant. as air pressure in an area increases, the density of the gas particles in that area increases and decreases in an alternating pattern. 3. which of the following correctly describes a way in which earth's atmosphere interacts with the geosphere? (2 points) it contains gases that living organisms breathe. it contains gases that trap incoming solar radiation. it provides a medium for cycles that provide nutrients to living organisms. it provides a medium for water to move between earth's surface and the air. 4. which of the following is considered a drawback to using wind energy as a source of power? (2 points) wind energy is nonrenewable. wind energy produces large amounts of air pollution. 5. a meteorologist predicts that the weather in a region will soon change from clear skies to probable thunderstorms. prior to making this prediction, what did the meteorologist most likely observe on a barometer? (2 points) the barometer fell slightly. the barometer fell substantially. the barometer rose slightly. the barometer rose substantially. 6. which of the following do meteorologists not typically use weather balloons to record? (2 points) atmospheric pressure cloud types humidity temperature 7. during which step in the can crush lab did water vapor force air from the can? (2 points) the can was filled nearly to the top with water. the can was placed on the hot stove top burner for several minutes. the can was removed from the hot stove top burner. the can was placed upside-down in the water-filled pan.

Acompound machine is also called a machine. a. force b. simple c. complex d. directional