Chapter 30: Quantum Physics
Physlet® Problems



1.  

The above graph represents intensity of light emitted from a hot object vs. the frequency of that light. What is the temperature of the object?    Start 
5.8 K.
0.0058 K.
5800 K.
Cannot Determine.

2.  

The above graphs represent the intensity of light emitted from various hot objects vs. the frequency of that light. Which object has the highest temperature?
Animation 1.
Animation 2.
Animation 3.
Animation 4.
Animation 5.
Cannot Determine.

3.  

A graph is shown representing the kinetic energy of ejected electrons verses the frequency of the incident light. The slider controls the frequency of the light (kinetic energy is given in eV and frequency is given in 1015Hz). What is the work function of the material in eV? Start
4.14 eV.
8.28 eV.
12.42 eV.
Cannot Determine.

4.  

A graph is shown representing the kinetic energy of ejected electrons verses the wavelength of the incident light. The slider controls the wavelength of the light (kinetic energy is given in eV and wavelength is given in nanometers, nm). What is the work function of the material in eV? Start
0.6 eV.
3.4x10-19 eV.
2.1 eV.
Cannot Determine.

5.  

A graph is shown representing the kinetic energy of ejected electrons verses the frequency of the incident light. The slider controls the frequency of the light (kinetic energy is given in eV and frequency is given in 1015 Hz). What is the velocity of the ejected electrons if the incident light has a frequency of 2.5x1015 Hz? Start
1.2x106 m/s.
1.9x106 m/s.
1.5x106 m/s.
Cannot Determine.

6.  

A 0.12 nm photon incident on a stationary electron, scatters as shown in the slow-motion animation above. Two depictions of the same event are given. What is the wavelength of the scattered photon?  
0.118 nm.
0.12 nm.
0.1207 nm.
0.122 nm.

7.  

A 0.12 nm photon incident on a stationary electron, scatters as shown in the slow-motion animation above. Two depictions of the same event are given. What is the wavelength of the scattered photon?   
0.1198 nm.
0.12 nm.
0.1207 nm.
0.1202 nm.

8.  

A 0.14 nm photon incident on a stationary electron, scatters as a 0.142 nm photon as shown in the slow-motion animation above. Two depictions of the same event are given. What is the magnitude of the velocity of the scattered electron?   
1.5 c.
3.8x10-4 c.
4.8x10-4 c.
Cannot Determine.

9.  

A 50 gram tennis ball moves to the right as shown in the animation (position given in centimeters and time given in seconds). What is the de Broglie wavelength of the tennis ball?  Start
2.4x10-12 m.
4.4x10-36 m.
4.4x10-34 m.

10.  

Photons (or electrons) are incident on a double slit (slit width of 1 mm and separation of 5 mm) and pass through to be detected on a screen as shown in the animations. What is the uncertainty of the momentum as measured at the screen?  
2.1 x 10-32 kg m/s.
9.0 x 10-33 kg m/s.
2.0 x 10-31 kg m/s.
1.0 x 10-31 kg m/s.

11.  

An electron is shown traveling to the  right in the above animation (position shown in nm). What is the uncertainty of the momentum of the electron? Start
1.6 x 10-23 kg m/s.
8 x 10-24 kg m/s.
2 x 10-24 kg m/s.
1 x 10-24 kg m/s.

Physlets used by permission of Wolfgang Christian, Davidson College. Physlet Problems ©Prentice Hall, Inc. Physlet problems on this web site were written by Wolfgang Christian, Mario Belloni, and Aaron Titus.


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