A neutron has a mass of 1.67 *10 - 27 kg.Its de Broglie wavelength is 1.4 *10 - 10 m.What is its kinetic energy (in eV)?

A) 4 B) 0.4 C) 0.04 D) 40 E) 0.08 A) 4 B) 0.4 C) 0.04 D) 40 E) 0.08

Exam 28: Quantum Physics

Microscopes are inherently limited by the wavelength of the light used.How much smaller (in order of magnitude)can we "see" using an electron microscope whose electrons have been accelerated through a potential difference of 50 000 V than using red light (500 nm)?

(Multiple Choice)

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Question 41

How much energy is in an 89.7 MHz photon of FM-radiation?

(Multiple Choice)

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Question 42

Calculate the ground state energy (in eV)for an electron in a box (an infinite well)having a width of 0.050 nm.

(Multiple Choice)

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Question 43

An electron has been accelerated by a potential difference of 100 V.If its position is known to have an uncertainty of 1 nm,what is the percent uncertainty ( $\Delta$ p/p * 100)of the electron?

(Multiple Choice)

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Question 44

A solid state pulsed laser has an energy of 400 mJ per pulse.If its wavelength is 1.06 *10 ^- ⁶ m,how many photons are in each pulse?

(Multiple Choice)

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Question 45

A neutron has a mass of 1.67 10 ^- ²⁷ kg.Its de Broglie wavelength is 1.4 10 ^- ¹⁰ m.What is its kinetic energy (in eV)?

(Multiple Choice)

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Question 46

Assume we can determine the position of a particle within an uncertainty of 0.5 nm.What will be the resulting uncertainty in the particle's momentum (in kg . m/s)?

(Multiple Choice)

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Question 47

A wave packet can represent a quantum particle because

(Multiple Choice)

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Question 48

What is the quantum number n of a particle of mass m confined to a one-dimensional box of length L when its energy is 2 h²/mL²?

(Multiple Choice)

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Question 49

If the interaction of a particle with its environment restricts the particle to a finite region of space,the result is the quantization of ____ of the particle.

(Multiple Choice)

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Question 50

Photoelectrons are ejected when monochromatic light shines on a freshly-prepared (oxide-free)sodium surface.In order to obtain the maximum increase in the number of electrons ejected per second,the experimenter needs to

(Multiple Choice)

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Question 51

When U(x)is infinitely large elsewhere,the wave function of a particle restricted to the region 0 < x < L where U(x)= 0,may have the form $\Delta$ (x)=

(Multiple Choice)

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Question 52

A stopping potential of 3.2 V is needed for radiation whose wavelength is 200 nm.What is the work function (in eV)of the material?

(Multiple Choice)

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Question 53

In an experiment different wavelengths of light,all able to eject photoelectrons,shine on a freshly prepared (oxide-free)zinc surface.Which statement is true?

(Multiple Choice)

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Question 54

The light intensity incident on a metallic surface produces photoelectrons with a maximum kinetic energy of 2 eV.The light intensity is doubled.Determine the maximum kinetic energy of the photoelectrons (in eV).

(Multiple Choice)

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Question 55

The wavelength of a 45-kg teenager moving at 5 m/s on a skateboard is about

(Multiple Choice)

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Question 56

Quantum tunneling occurs in

(Multiple Choice)

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Question 57

Suppose we use optical radiation ( $\lambda$ = 500 nm)to determine the position of the electron to within the wavelength of the light.What will be the resulting uncertainty in the electron's velocity?

(Short Answer)

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Question 58

Assume the Heisenberg uncertainty principle can take the form $\Delta$ E $\Delta$ t $\ge$ h/4B.How accurate can the position of an electron be made if its speed is 5 * 10⁶ m/s and if the uncertainty in its energy is 10 eV?

(Multiple Choice)

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Question 59

A photon collides with an electron.After the collision the wavelength of the scattered wave at a scattering angle greater than $0 ^ { \circ }$ is

(Multiple Choice)

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Question 60

Showing 41 - 60 of 69

Exam 28: Quantum Physics

Microscopes are inherently limited by the wavelength of the light used.How much smaller (in order of magnitude)can we "see" using an electron microscope whose electrons have been accelerated through a potential difference of 50 000 V than using red light (500 nm)?

How much energy is in an 89.7 MHz photon of FM-radiation?

Calculate the ground state energy (in eV)for an electron in a box (an infinite well)having a width of 0.050 nm.

An electron has been accelerated by a potential difference of 100 V.If its position is known to have an uncertainty of 1 nm,what is the percent uncertainty ( Δ\DeltaΔ p/p * 100)of the electron?

A solid state pulsed laser has an energy of 400 mJ per pulse.If its wavelength is 1.06 *10 - 6 m,how many photons are in each pulse?

A neutron has a mass of 1.67 *10 - 27 kg.Its de Broglie wavelength is 1.4 *10 - 10 m.What is its kinetic energy (in eV)?

Assume we can determine the position of a particle within an uncertainty of 0.5 nm.What will be the resulting uncertainty in the particle's momentum (in kg . m/s)?

A wave packet can represent a quantum particle because

What is the quantum number n of a particle of mass m confined to a one-dimensional box of length L when its energy is 2 h2/mL2?

If the interaction of a particle with its environment restricts the particle to a finite region of space,the result is the quantization of ____ of the particle.

Photoelectrons are ejected when monochromatic light shines on a freshly-prepared (oxide-free)sodium surface.In order to obtain the maximum increase in the number of electrons ejected per second,the experimenter needs to

When U(x)is infinitely large elsewhere,the wave function of a particle restricted to the region 0 < x < L where U(x)= 0,may have the form Δ\DeltaΔ (x)=

A stopping potential of 3.2 V is needed for radiation whose wavelength is 200 nm.What is the work function (in eV)of the material?

In an experiment different wavelengths of light,all able to eject photoelectrons,shine on a freshly prepared (oxide-free)zinc surface.Which statement is true?

The light intensity incident on a metallic surface produces photoelectrons with a maximum kinetic energy of 2 eV.The light intensity is doubled.Determine the maximum kinetic energy of the photoelectrons (in eV).

The wavelength of a 45-kg teenager moving at 5 m/s on a skateboard is about

Quantum tunneling occurs in

Suppose we use optical radiation ( λ\lambdaλ = 500 nm)to determine the position of the electron to within the wavelength of the light.What will be the resulting uncertainty in the electron's velocity?

Assume the Heisenberg uncertainty principle can take the form Δ\DeltaΔ E Δ\DeltaΔ t ≥\ge≥ h/4B.How accurate can the position of an electron be made if its speed is 5 * 106 m/s and if the uncertainty in its energy is 10 eV?

A photon collides with an electron.After the collision the wavelength of the scattered wave at a scattering angle greater than 0∘0 ^ { \circ }0∘ is

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An electron has been accelerated by a potential difference of 100 V.If its position is known to have an uncertainty of 1 nm,what is the percent uncertainty ( $\Delta$ p/p * 100)of the electron?

A solid state pulsed laser has an energy of 400 mJ per pulse.If its wavelength is 1.06 *10 ^- ⁶ m,how many photons are in each pulse?

A neutron has a mass of 1.67 10 ^- ²⁷ kg.Its de Broglie wavelength is 1.4 10 ^- ¹⁰ m.What is its kinetic energy (in eV)?

What is the quantum number n of a particle of mass m confined to a one-dimensional box of length L when its energy is 2 h²/mL²?

When U(x)is infinitely large elsewhere,the wave function of a particle restricted to the region 0 < x < L where U(x)= 0,may have the form $\Delta$ (x)=

Suppose we use optical radiation ( $\lambda$ = 500 nm)to determine the position of the electron to within the wavelength of the light.What will be the resulting uncertainty in the electron's velocity?

Assume the Heisenberg uncertainty principle can take the form $\Delta$ E $\Delta$ t $\ge$ h/4B.How accurate can the position of an electron be made if its speed is 5 * 10⁶ m/s and if the uncertainty in its energy is 10 eV?

A photon collides with an electron.After the collision the wavelength of the scattered wave at a scattering angle greater than $0 ^ { \circ }$ is