Given the potential difference between the terminals of a battery as 5 Volts, calculate the amount of energy needed to move 6.67E10^18 electrons.
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- (4) Find the Fermi energy of lithium EF, the Fermi temperature TF, and the speed of vF of the fastest free electrons.(4) Electrons are no longer ejected from a sample of metal whenever it is illuminated by light with wavelength greater than 344nm. (a) Based on the table below, what is the most likely metal being illuminated? (b) If the sample is illuminated by light with wavelength 48.3nm, what is the stopping potential? (c) In the event this sample of metal were replaced by a metal with a smaller work function, but still illuminated with light with 48.3nm, would the kinetic energy of the ejected electrons increase or decrease? (d) What is the threshold frequency for cesium? Atom W (eV) Cesium 2.1 Calcium 2.9 Uranium 3.6 Cadmium 4.07 Lead 4.14 Niobium 4.3 Iron 4.5 Copper Cobalt 4.7 5 Gold 5.11 Platinum 6.35A helium plasma with equilibrium electron density noe and equilibrium positive ion density noi. The quasi-neutrality of such a plasma means a. noe =noi b. The plasma ions and electrons have screened Coulomb potentials O c. The plasma ions are at rest d. noe only follows a Maxwellian distribution е. По — 2поe O f. The plasma is at rest g. noe = 2noi h. noe and noi follow a Maxwellian distribution
- Proton 1 moves with a speed v from theeast coast to the west coast in the continental United States; proton 2 moves with the same speed from the southern United Statestoward Canada. (a) Is the magnitude of the magnetic force experienced by proton 2 greater than, less than, or equal to the forceexperienced by proton 1? (b) Choose the best explanation fromamong the following:I. The protons experience the same force because the magneticfield is the same and their speeds are the same.II. Proton 1 experiences the greater force because it moves atright angles to the magnetic field.III. Proton 2 experiences the greater force because it moves in thesame direction as the magnetic field.Give title to the 2 tables:Need the most help with the question 5B and 5C.PLS DO EACH OF THEM.
- In your own words, describe why metals are such good conductors of electricity. Be sure to include the definition of metallic bond in your answer. Answer in 2 to 3 complete sentences. I !!! H Normal A Enter your answer here BIUS √x 20 TxVariable electrovalency is shown by which block elements?Find the electric potential energy of an Na+ ion and a Cl- ion separated by 0.24 nm. Consider the ions as point charges.
- a) Under equilibrium condition, what is the probability of an electron state beingoccupied if it is located at the Fermi level?(b) If EF is positioned at Ec , determine the probability of finding electrons in states atEc + kT. (A numerical answer is required.)(c) The probability of a state being filled at Ec + kT is equal to the probability of astate being empty at Ec + 3 kT. Where is the Fermi level located?An ideal Pa fstom a volume oļ 1.00 m3 to gos exbands at a constant boressune of 6.00x105 a volume of 4.00 m3 and comstant a v0lume of 4.00 m a then is combstezBed to one - thistd that pressuHe and then is compsteBBed to volume of 2.50 m3 as showen in tthe figuHe below befote sretusining Piguare to its initial state , How much woork is done in showwn gas thorough cycle of the þoiocess shown. Pliot Pa) taking a a one in the figune ? ANS;→ Tatom the P-v diagian Fat the P-V diagiam we 00Determine the crystal structure for the following: (a) a metal with a0 = 4.9489 Å, r = 1.75 Å and one atom per lattice point; and (b) a metal with a0 = 0.42906 nm, r = 0.1858 nm and one atom per lattice point.