The state of an atom, just below a higher excited state, which an electron occupies momentarily before destabilizing and emitting light (it is the upper of two lasing levels) is called: Stable. Laser medium. Unstable. Metastable.
What would be the magnitude of the resulting force between an object of charge 75mu C and another object of charge 50mu C that are placed 4 m apart? 3.75 N 3.14 N 1.40 N 1.69 N
4. Which of the following is considered to be a vector? A. Temperature B. Time C. Velocity D. Mass
Heat caused by friction will __ A. enhance the performance of your vehicle's engine. B. not affect the performance of your vehicle's engine. C. lower the performance of your vehicle's engine.
Time-varying gradient magnetic fields can lead to which of the following symptoms? Dizziness and nausea Hearing loss Tingling or stimulation Hypothermia
Jill is at the edge of a 30.0 m high cliff and throws a rock with a velocity of 10.0m/s at an angle of 20.0 degrees. How long will it take the rock to hit the water? 285 s 3.23 s 3.56 s 3.86 s
What causes a sonic boom? The noise of the plane's engines in the effort to overcome drag forces. The sound of the air being suddenly heated by viscous friction between it and the plane The shock wave formed by wave crests piling up on each other.
Which type of matter is commonly found in the universe, but not commonly found on Earth? a plasma b solid c gas d liquid
What two things balance to maintain the shape of a star? A. Pressure and gravity B. Pressure and velocity C. Orbiting and gravity
The duration of the time delay start is approximately? 0 to 15 seconds 25 seconds 25 to 40 second 0 to 12 seconds
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?
Which of the following expressions correspond to the energy-time uncertainty principle? $\Delta E\Delta t\geqslant 2\bar {h}$ $\Delta E\Delta t\geqslant \hat {h}$ $\Delta E\Delta t\geqslant \frac {h}{2}$ $\Delta \omega \Delta t\geqslant \bar {h}$
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}
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.
For Newton's third law the action and reaction forces are equal in magnitude and opposite in direction. A True B False
Which one of the following actions will increase the current ratio, all else constant? Assume the current ratio is greater than 1.0
11. ¿Qué es un campo gravitacional? A) Una región donde se experimenta una fuerza eléctrica. B) Una región donde se experimenta una fuerza magnética. C) Una región donde se experimenta una fuerza gravitacional D) Una región sin ninguna fuerza.
Why is a solid less compressible than a gas? Gases have more volume Solids are made of metals Solid particles are tightly packed Solids are heavier
