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PHYS 201 Recitation 6 Flashcards | StudBud
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PHYS 201 Recitation 6
PHYS 201 Recitation 6
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1
Which expression gives the relativistic momentum of a moving object?
\gamma m\vec{v}
\frac{mc}{\gamma}
\gamma mc
\frac{mc^2}{v}
2
Simultaneity is relative: events that are simultaneous in one frame might not be simultaneous in another frame.
True
False
3
A photon checks into a hotel and the bellhop asks him if he has any luggage. What does the photon say?
yes, I have it right here
oh no, I left it at the airport
no, I'm traveling light
yes, it's in the car
4
Which equation relates a photon's
energy
to its
frequency
?
E=\frac{hc}{\lambda}
E=h\lambda
E=\frac{hc}{f}
E=hf
5
Which of the following is an example of the uncertainty principle?
\Delta E\Delta t\ge\frac{1}{2}
\Delta p_x\Delta p_y\ge\frac{\hbar}{2}
\Delta x\Delta y\ge\frac{\hbar}{2}
\Delta t\Delta E\ge\frac{\hbar}{2}
6
What is the Doppler effect?
E=mc^2
the frequency shift in light due to relative motion of source and observer
the combined effects of time dilation and length contraction
the speed shift in light due to relative motion of source and observer
7
Which expression gives the relativistic kinetic energy of a moving object?
\gamma m\vec{v}
(\gamma-1)mc^2
(mc^2)^2+(pc)^2
\gamma mc^2
8
What is the formula for the Lorentz factor?
E=mc^2
\gamma=\frac{1}{\sqrt{1-\frac{v^2}{c^2}}}
\gamma=\sqrt{1-\frac{v^2}{c^2}}
\gamma=\frac{v}{c}
9
What is the equation for length contraction?
\Delta x=\frac{v}{c}\Delta x_0
\Delta x=\gamma\Delta x_0
\Delta x=\frac{\Delta x_0}{\gamma}
\Delta x=\gamma\left(\Delta x_0-u\Delta t\right)
10
Which phenomenon is described by the equation eV_0=hf-\phi?
the photovoltaic effect
Compton scattering
Bremsstrahlung
the photoelectric effect
11
Simultaneity is absolute: events that are simultaneous in one frame
must
be simultaneous in all other frames.
False
True
12
What does the variable γ represent in special relativity?
the Leibniz factor
the Einstein factor
gamma
the Lorentz factor
13
Which equation relates a photon's
energy
to its
wavelength
?
E=\frac{hc}{f}
E=\frac{hc}{\lambda}
E=hf
E=h\lambda
14
Which of the following is an example of the uncertainty principle?
\Delta x\Delta y\ge\frac{\hbar}{2}
\Delta x\Delta p\ge\frac{\hbar}{2}
\Delta p_x\Delta p_y\ge\frac{\hbar}{2}
\Delta x\Delta p\ge\frac{1}{2}
15
The fundamental laws of physics have the same form in all inertial frames of reference.
False
True
16
Which phenomenon is described by the equation \lambda'-\lambda=\frac{h}{mc}\left(1-\cos\phi\right)?
the photoelectric effect
Rayleigh scattering
Thomson scattering
Compton scattering
17
If two events occur at the same point in space in a frame, the time interval between events measured in that frame is:
the absolute time interval
the correct time interval
the proper time interval
the true time interval
18
What is the equation for time dilation?
\Delta t=\gamma\left(\Delta t_0-\frac{u\Delta x}{c^2}\right)
\Delta t=\frac{v}{c}\Delta t_0
\Delta t=\frac{\Delta t_0}{\gamma}
\Delta t=\gamma\Delta t_0
19
What property of a photon is given by the expression: \frac{h}{\lambda}
energy
position
velocity
momentum
20
Light appears to travel faster in fast-moving reference frames.
False
True
21
Which phenomenon is described by the equation eV_{AC}=hf_{\text{max}}=\frac{hc}{\lambda_{\text{min}}}?
Compton scattering
pair production
photon production
Bremsstrahlung
22
The speed of light in vacuum is the same in all inertial frames.
False
True
