6. An astronomical system which places the Earth at the center of the universe is called:
(J) Which factor does NOT affect kinetic energy? a. Speed b. Height c. Velocity d. Mass
What energy transfer occurs , when a solar panel uses sunlight to provide power to a house? Radiant energy is converted to electrical energy. Radiant energy is converted to mechanical energy. Thermal energy is converted to electrical energy. Thermal energy is converted to mechanical energy.
The primary harm from radiological materials is: mechanical. chemical. thermal. radiological.
According to Boyle's Law under the same temperature condition, if the volume of a constant amount of gas decreases by 2 (half), then the gas pressure should stay the same decrease by 2 increase by 2 unpredictable
A 2.40 kg block of ice is heated with 5820 J of heat.The specific heat of ice is 2.10Jcdot g^-1cdot ^circ C^-1 By how much will its temperature rise , assuming it does not melt? a 15,500,000^circ C b 15,500^circ C C 115^circ C d 1.15^circ C
What produces musical sound by vibrating when the body of the instrument itself is struck, stamped, shaken , scraped, rubbed, or plucked? Idiophones Membranophones Aerophones Chordophones
Select the best equation to solve the problem. A car in motion takes 7.81 s to come to a complete stop . It travels 100 m in that time. What was the acceleration of the car? A) Delta x=(1)/(2)(v_(f)+v_(i))t B) v_(f)=v_(i)+at C) v_(f)^2=v_(i)^2+2aDelta x D) Delta x=v_(f)t-(1)/(2)at^2 E) Delta x=v_(i)t+(1)/(2)at^2 Enter letter option A . B. C, D, or E. Hint: Identify the variables stated in the problem. Do we know the initial velocity?
The output intensity of an x-ray tube is 3.0mR/mAs when operated at 80 kVp at a distance of100 cm . What would the output intensity be at 200 cm. from the tube? (show your work)
1) Why does the pressure go up when there are more particles in the container? 2) What happens to the pressure when you decrease the size of the container? Why? 3) What is assumed to be constant in Boyle's law? How are pressure and volume of a gas related?
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. $\frac {1}{5}$
