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1

Calculate the wavelength of visible light having a frequency of 4.37 x 10^{14} s^{-1}.

A)

12.0 nm

B)

343 nm

C)

686 nm

D)

674 nm

E)

none of the above

2

The frequency of electromagnetic radiation of wavelength 5.6 mm is

A)

5.4 x 10^{7} Hz

B)

1.9 x 10^{-11} Hz

C)

5.4 x 10^{10} Hz

D)

1.1 x 10^{8} Hz

E)

none of the above

3

The wavelength of a beam of light is 24 mm. What is the energy of one of its photons?

A)

5.3 x 10^{-47} J

B)

8.3 x 10^{-24} J

C)

5.3 x 10^{-45} J

D)

-8.3 x 10^{-21} J

E)

none of the above

4

Refer to the absorption spectrum of chlorophyll a in Figure B7.4 in your textbook. Which of the following statements is false?

A)

Chlorophyll a absorbs light of wavelengths between 400 and 480 nm.

B)

Chlorophyll a absorbs light of wavelengths between 640 and 680 nm.

C)

Chlorophyll a transmits light of wavelengths between 500 and 600 nm.

D)

Chlorophyll a has a maximum absorbance at a wavelength near 450 nm.

E)

Chlorophyll a has a maximum transmittance at a wavelength of 663 nm.

5

The Rydberg equation, with n_{1} = 1, predicts an ultraviolet series of spectral lines of atomic hydrogen. Which of the following wavelengths is not predicted by the equation?
Rydberg equation: 1/ (0.0K) = (1.097 x 10^{7} m^{-1}) x (1/n_{1}^{2} - 1/n_{2}^{2})

A)

182 nm

B)

103 nm

C)

97 nm

D)

95 nm

E)

91 nm

6

In Bohr's model of the hydrogen atom, the radius of an orbit

A)

is proportional to n^{2}.

B)

is smallest for the highest energy state.

C)

increases when a photon of light is emitted from an excited atom.

D)

can have any value that is larger than the ground-state radius.

E)

none of the above

7

Calculate the frequency of the light emitted by a hydrogen atom during a transition of its electron from the n = 3 to n = 1 energy level, based on the Bohr theory.
Use the equation E_{n} = -2.18 x 10^{-18} J(1/n^{2})

A)

2.92 x 10^{15}s^{-1}

B)

1.94 x 10^{-18}s^{-1}

C)

3.21 x 10^{15}s^{-1}

D)

3.05 x 10^{-15}s^{-1}

E)

Not enough information given to calculate answer.

8

According to Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
Use the equation: E_{n} = (-2.18 x 10^{-18} J)(1/n^{2})

A)

n = 5 to n = 3

B)

n = 6 to n = 1

C)

n = 4 to n = 3

D)

n = 5 to n = 4

E)

n = 6 to n = 5

9

The de Broglie wavelength for a baseball moving at 25.0 m/s is 2 x 10^{-34} m. If a baseball could travel at the speed of light, what would be its de Broglie wavelength at that speed?

A)

1.7 x 10^{-41} m

B)

1.5 x 10^{-26} m

C)

1.7 x 10^{-43} m

D)

1.5 x 10^{-28} m

E)

1.5 x 10^{-24} m

10

According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 x 10^{3} m/s, the uncertainty in its position (in m) is at least

A)

66 m

B)

17 m

C)

6.6 x 10^{-8} m

D)

1.7 x 10^{-8} m

E)

none of the above

11

Which of the following atoms is not a one-electron system?

A)

H

B)

He^{+}

C)

Li^{2+}

D)

Be^{2+}

E)

O^{7+}

12

What value or values of m_{l} are allowable for an orbital with l = 2?

A)

0

B)

2

C)

-1

D)

none of the above

E)

all of the above

13

According to the quantum-mechanical model, how many orbitals in a given atom have n = 3?

A)

4

B)

7

C)

9

D)

10

E)

18

14

The nodes for a 3s atomic orbital are

A)

two points near the nucleus and another point at an infinite distance from the nucleus.

B)

three spherical solids.

C)

one plane and two spheres.

D)

two concentric circles.

E)

two concentric spheres.

15

Consider a 3d_{xz} orbital. Which of the following statements is incorrect?

A)

The xz plane is a nodal surface.

B)

The xz plane divides the electron probability distribution into two identical mirror-image halves.

C)

The xy plane divides the electron probability distribution into two identical mirror-image halves.

D)

The yz plane divides the electron probability distribution into two identical mirror-image halves.

E)

The nucleus is located at a node.

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