# physical chemistry

 Psi(x, t) has no direct physical meaning true The kinetic energy of a wavefunction is related to its curvature true For a general one-dimensional wavefunction Psi(x), the wavevector |Psi> is infinite-dimensional true Given a general wavefunction Psi(x,t) and two compatible observables, Aˆ and Bˆ , any measurement of Bˆ yields the same result as a measurement of Aˆ and then Bˆ false According to the uncertainty principle, if sigma_x is very large, then the momentum is well determined false The Psin ’s for the quantum harmonic oscillator go to zero at the classical turning points, that is Psin(x)=0 when V(x)=En, where V(x) is the harmonic potential false For a free particle, [Hˆ, pˆ] = 0 true If a single particle approaches a potential barrier, its wavefunction is always completely transmitted if it has kinetic energy above the height of the barrier false Stationary states have a probability density that does not change with time true Psi(x, t) can be both positive and negative true When we measure the energy of a quantum harmonic oscillator we always get one of its eigenvalues, En . true For a one-dimensional wavefunction , the wavevector psi is always one dimensional false For an ensemble of identically prepared quantum mechanical particles, if =0 then

=0 true In quantum mechanics, two wavefunctions are always orthogonal false In quantum mechanics, sometimes the measurement of an observable never yields the expectation value of that observable true The uncertainty principle allows us to measure the position of a quantum mechanical particle exactly true If a single quantum mechanical particle approaches a potential barrier, its wavefunction can be both reflected and transmitted at the same time true The function exp(kx) with k real and positive is in Hilbert space false For an electron, the value s can be +,-1/2 false In quantum mechanics, an electron and proton are always distinguishable true the Pauli exclusion principle applies to both fermions and boson false It is possible to have the following term symbol for a multielectron atomic state 1D1 false If we know a wavefunction near one atom in a solid, Bloch's theorem allow us to know this wavefunction at the equivalent position near every other atom within the solid true the variational principle allows one to minimize the ground state energy by varying H^' false In a multielectron atoms, he 3p orbitals are lower in energy than the 4s orbitals true for two identical fermions, the spatial component of the overall wavefunction must be antisymmetric with respect to exchange false for a single-particle system with a spherically symmetric potential, the eigenfunctions of H^will involve the spherical harmonics true L^2 and L^x are compatible observables true the term symbol for an atomic state with J=2, L=1, and S=0 is 1D1 false for an electron, the general spin tate can be represented by the column vector (a b)' true for multielectron atoms, the energy of the single-particle states only depends on n false In our mathematical treatment of the hydrogen atom, the potential energy function only affected the radial equation true perturbation theory is mostly concerned with the calculation of the ground state energy false semiconductors have band gaps, but insulators do not false Bloch's theorem states that the wavefunction in a solid is the same for each atom in the solid fasle the electron has a spin angular momentum because it is rotating in space false Authorstu90 ID97334 Card Setphysical chemistry Descriptiontrue/false quiz for quantum mechanics basic course Updated2011-08-17T18:50:16Z Show Answers