How can Bill increase the energy of the bowling ball so that it does swing back and hit him in the nose? Make the string longer. Use a bowling ball with less mass. Lift the bowling ball up
(10 points) You have 125 grams of an isotope that decays at 4.5% per day. a. Write an expression representing the quantity Q(t) at time t in days. b. What is the half-life of the isotope?
How would you compare the magnetic field generated by a simple length of wire to the magnetic field generated by a coil of wire? The coil generates a stronger magnetic field The coil generates a weaker magnetic field The field generated by the coil has a different polarity than the field generated by the length of wire The coil generates a field that attracts iron objects; the length of wire generates a field that attracts silver objects
Radium-223 (_(88)^223Ra) undergoes gamma decay to produce what daughter isotope and decay particle? a (}_{88)^223Ra+gamma b (}_{88)^222Ra+gamma C (}_{86)^220Rn+gamma d (}_{86)^222Rn+gamma
How many nanoseconds are in 7 seconds?? A 7,000,000 B 7,000,000,000 C 7 million D 0.00000007
How does the electrostatio force compare with the strong nuclear force in the nucleus of an atom? A. The electrostatic force is weaker and is only attractive. B. The electrostatic force is weaker and acts over longer distances. C. The electrostatic force is stronger and is only repulsive. D. The electrostatic force is stronger and acts over shorter distances.
Which model best describes how gravity causes star formation? A. A cup of water is dumped on the ground, where it forms a small pool. B. Two mugs crash into each other and break into many small pieces. C. A long spool of thread is unwound and then wound back up. D. A snowball grows as more snow sticks to it.
What type of stuff can be refracted?Choose the best answer. A. Light B. Sound C. Heat D. Anything that travels in waves
The car slowed down as it approached the stop sign. velocity acceleration speed
Newton's second law states that the acceleration of an object equals the net force acting on the object divided by the object's acceleration
Which of the following describe the expansion coefficients for a general state? $a_{n}=\langle \psi _{n}\vert \psi \rangle =\int _{-\infty }^{\infty }dx\psi _{n}^{\ast }(x)\psi (x)$ $a_{n}=(\sum _{n}\vert \psi _{n}\rangle )\vert \psi \rangle $ $a_{n}=\langle \psi _{n}\vert \psi \rangle ^{\ast }=\int _{-\infty }^{\infty }dx\psi _{n}(x)\psi ^{\ast }(x)$ $a_{n}=\langle \psi _{n}\vert \psi _{m}\rangle =\int _{-\infty }^{\infty }dx\psi _{n}^{\ast }(x)\psi _{m}(x)$
A certain wave function is given by $\psi (x)=\{ \begin{matrix} A&for-a\leqslant x\leqslant a\\ 0&otherwise\end{matrix} $ Which of the following corresponds to the Fourier transform for this wave function? A sum of spherical harmonics. A sum of sines and cosines. A sum of Hankel functions. The Dirac delta function.
8> What is the random capture theory? Which theory best explains how our solar system was created?
A wave function can be expanded in basis states as $\vert \psi \rangle =\sum _{n}a_{n}\vert \psi _{n}\rangle $ What must be true of the expansion coefficients? $\sum _{n}\vert a_{n}\vert ^{2}=1$ They must be real numbers. There is no restrictions on the coefficients. $\sum _{n}a_{n}=1$
Match each statement to the wave interaction it describes. \begin{array}{|l|l|} \hline\ reflection\ &\ Waves\ bounce\ off\ an\ object.\ \\ \hline\ absorption\ &\ Waves\ are\ taken\ in\ by\ an\ object.\ \\ \hline\ transmission\ &\ Waves\ bend\ while\ passing\ from\ one\ medium\ to\ another.\ \\ \hline\ diffraction\ &\ Waves\ scatter\ through\ an\ opening\ or\ around\ an\ object.\ \\ \hline\ retraction\ &\ Waves\ go\ through\ an\ object.\ \\ \hline \end{array}
Which of the following expressions correspond to the energy-time uncertainty principle? $\Delta E\Delta t\geqslant 2\bar {h}$ $\Delta E\Delta t\geqslant \hat {h}$ $\Delta E\Delta t\geqslant \frac {h}{2}$ $\Delta \omega \Delta t\geqslant \bar {h}$
Consider the following force: A fridge magnet is pulling on a paper clip. According to Newton's third law what other force must be happening? The paper clip is pushing on the fridge magnet. The paper clip is pulling on the fridge magnet.
Which of the following correspond to the first-order shift in energies using time-independent perturbation theory? $\vert \langle \psi _{n}^{0}\vert \delta \hat {H}\vert \psi _{n}^{0}\rangle \vert ^{2}$ $\langle \psi _{n}^{0}\vert \delta \hat {H}\vert \psi _{n}^{0}\rangle $ $\sum _{m\neq n}\frac {\langle \psi _{n}^{0}\vert \delta \hat {H}\vert \psi _{n}^{0}\rangle }{E_{m}^{0}-E_$ $\sum _{m\neq n}\frac {\vert \langle \psi _{m}^{o}\vert \delta \hat {H}\vert \psi _{n}^{o})\vert ^{2}}{E_{m}^$
Which one of the following actions will increase the current ratio, all else constant? Assume the current ratio is greater than 1.0
If a wave function is given in terms of orthonormal wave functions as $\vert \psi \rangle =\frac {1}{\sqrt {5}}\vert \psi _{1}\rangle +\sqrt {\frac {3}{5}}\vert \psi _{2}\rangle +A\vert \psi _{3}\rangle $ Then what must be true about A? $\frac {1}{\sqrt {5}}$ $\frac {1}{2}$ There is not enough information to determine A. $\frac {1}{5}$
