Which of the following statements involving unit prefixes is incorrect? There are 10^3 micrometers in a millimeter There are 10^6 nanometers in a millimeter There are 10^3 centimeters in a meter There are 10^3 millimeters in a meter
If a wire carrying current causes the needle of a compass to move: A. it disproves Ohm's law. B. it demonstrates electromagnetism. C. it proves Ohm's law. D. it is an example of an open circuit.
What are the respective electrical charges of a proton ,a neutron, and an electron? +1 -1 -1 +1 0,+1,-1
The process of melting and vaporization are examples of square processes where particles square energy.
Which of the following statements is TRUE? The Earth orbits the Sun within a portion of the Sun's outer atmosphere. The temperature of the Sun's atmosphere decreases with distance from the Sun's surface. The Earth's diameter is about the same as the thickness of the Sun's chromosphere. The Sun's photosphere constitutes about 10% of the Sun's cross-section.
In what way is the rule for the interaction between magnetic poles similar to the rule for the interaction between electric charges?
A baseball is tossed upward with an initial velocity of +36m/s rises to some high position, and then falls back down to be caught at its original release position. What is the value of its velocity 4 seconds after release? -36m/s -4m/s -10m/s/s 0m/s 4m/s +10m/s/s
2. When electrical energy is used what type of energy is also produced and considered to be waste energy? Thermal energy Nuclear energy Mechanical energy Radiant energy
How would you determine the absolute zero temperature? a) Approach it using a gas thermometer at very low pressure b) Measure it using a mercury thermometer at the temperature that nitrogen boils c) You can not determine that temperature d) Measure it using a gas thermometer at zero pressure
61. Why does a red shirt look red? A) Because it absorbs red light. B) Because it is transparent to red light. C) Because it is creating and emitting red light. D) Because it absorbs all colors of light except red which is reflected. 62. Why does a black shirt look black? A) Because it absorbs black light. B) Because it is transparent to black light. C) Because it reflects black light. D) Because it absorbs all colors of light and does not reflect any colors of light. 63. Which of the following is the taking in of wave energy by a surface and converting it to a different form? A) absorption B) transmission C) refraction D) reflection 64. Which of the following is when a wave changes direction as it enters a new medium? A) absorption B) transmission C) refraction D) reflection 65. Why are sunsets and sunrises red/orange in color? A) Red color has low frequency and is scattered more B) Red color has high frequency and is scattered more C) Red color has low frequency and is scattered less D. Red color has high frequency and is scattered less 66. What is the relationship between signal quality and distance that the signal can travel? A) Low quality signals travel longer distances B) Low quality signals travel shorter distances C) High quality signals travel longer distances D) All signal qualities travel the same distance 67. Calculate the speed of light in glass that has an index of 1.627 . A) 1.4times 10^8m/s B) 1.8times 10^8m/s C) 3.0times 10^8m/s D) 4.9times 10^8m/s
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
