Gin this next question electrons of a given kinetic energy - instead of photons - are incident to an atom. while photon absorption is an all or nothing process, electrons can loose also just some kinetic energy. interaction of these electrons with the atoms in the target may result in emission of photons. which of the following statements are true? select all answers that apply. the kinetic energy of the "beam" electrons exceeds the binding energy of an electron in the target atom. the atom becomes ionized; left behind is a vacancy in a lower energy bound state. the kinetic energy of a "beam" electron exceeds the energy necessary to excite an electron (in the target atom) into an unoccupied higher energy level of another bound state. electrons (from the beam) can only give off all their kinetic energy in one interaction. electrons (from the beam) can interact several times with the target atom and lose some of their kinetic energy in each such interaction process.

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

Fill in the blanks with the numbers is a measure of the resistance to flow. a high liquid has a high resistance to flow and flows slowly. the ancients thought everything in the world was made of 4 we now know that there are 94 naturally occurring and scientists have created another 24 i am certain they will create even more. honey flows slowly because it has a high to flowing. a can be separated by physical means because it contains more than one pure substance and 2 pure substances are not chemically bonded to each other. a cannot be separated by physical means. all matter is made up of all elements are with the same number of protons. if it is just a single or many bonded together, if all of them have the same number of protons, it is an element. in a piece of pure iron metal, all the are joined together, that piece of iron metal is called elemental iron. a single of iron is called elemental iron. a mixture has differences from place to place. we might need a microscope to see them or they might be obvious to the unaided eye. there are surfaces separating it into different phases. a mixture is the same everywhere. it is uniform. there are no surfaces separating it into different phases. if different kinds of atoms (different elements) are bonded together by their electrons, it is called a there are physical means of to isolate the different pure substances in a mixture and there are chemical means of to isolate the different elements in a compound. 1. element 2. compound 3. mixture 4. heterogeneous 5. homogeneous 6. pure substance 7. atoms 8. separation 9. viscosity 10. resistance

The energy equivalent of the rest mass of an electron is