Q: A sodium lamp emits light at a wavelength of $$\lambda = 589\ \mathrm{nm}. $$What is the energy of a single photon of this light? (Planck's constant $$h = 6.626 \times 10$$^{-34}$$\ \mathrm{J\cdot s}$$, speed of light $$c = 3.00 \times 10^8$\ \mathrm{m/s})$$

$$3.38 \times 10$$^{-19}$$\ \mathrm{J}$$

Q: The threshold frequency for the photoelectric effect in silver is $$1.14 \times 10$$^{15}$$\ \mathrm{Hz}. $$What is the minimum energy (work function) required to eject an electron from silver?

$$7.56 \times 10$$^{-19}$$\ \mathrm{J}$$

Q: What is the de Broglie wavelength of a hydrogen atom moving at $$7.00 \times 10^2$\ \mathrm{cm/s}$$? (Mass of H atom $$= 1.67 \times 10$$^{-27}$$\ \mathrm{kg}$$, $$h = 6.626 \times 10$$^{-34}$$\ \mathrm{J\cdot s})$$

$$5.66 \times 10$$^{-7}$$\ \mathrm{m}$$

Question 1

Which of the following best describes the relationship between the energy and wavelength of electromagnetic radiation?

Accepted Answer

Energy is inversely proportional to wavelength.

Question 2

A sodium lamp emits light at a wavelength of $$\lambda = 589\ \mathrm{nm}. $$What is the energy of a single photon of this light? (Planck's constant $$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s}$$, speed of light $$c = 3.00 	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

$$3.38 	imes 10$$^{-19}$$\ \mathrm{J}$$

Question 3

Which phenomenon provides evidence for the particle-like nature of light?

Accepted Answer

Photoelectric effect

Question 4

The threshold frequency for the photoelectric effect in silver is $$1.14 	imes 10$$^{15}$$\ \mathrm{Hz}. $$What is the minimum energy (work function) required to eject an electron from silver?

Accepted Answer

$$7.56 	imes 10$$^{-19}$$\ \mathrm{J}$$

Question 5

Which of the following transitions in a hydrogen atom emits the highest energy photon?

Accepted Answer

$$n=2 to$$ $$n=1$$

Question 6

A laser emits $$0.376\ \mathrm{J} of $$energy per pulse at a wavelength of $$633\ \mathrm{nm}. $$How many photons are emitted per pulse? ($$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s}$$, $$c = 3.00 	imes 10^8$\ \mathrm{m/s})$$

Accepted Answer

$$1.19 	imes 10$$^{18}$$

Question 7

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 8

Which of the following electron configurations is correct for the ground state of copper (Cu)?

Accepted Answer

$$1s^22s^22$p^63s^23$p^64s^13$d^{10}$$

Question 9

Which principle states that no two electrons in an atom can have the same set of four quantum numbers?

Accepted Answer

Pauli Exclusion Principle

Question 10

Which orbital has the greatest penetration to the nucleus in a multi-electron atom?

Accepted Answer

$$1s$$

Question 11

Which of the following best explains the large jump in ionization energy when removing an electron from a sodium ion ($$\mathrm{Na^+}$$)?

Accepted Answer

The electron is being removed from a core shell, which is much closer to the nucleus.

Question 12

Which of the following statements about blackbody radiation is correct?

Accepted Answer

The hotter the object, the shorter the wavelength of maximum emission.

Question 13

What is the de Broglie wavelength of a hydrogen atom moving at $$7.00 	imes 10^2$\ \mathrm{cm/s}$$? (Mass of H atom $$= 1.67 	imes 10$$^{-27}$$\ \mathrm{kg}$$, $$h = 6.626 	imes 10$$^{-34}$$\ \mathrm{J\cdot s})$$

Accepted Answer

$$5.66 	imes 10$$^{-7}$$\ \mathrm{m}$$

Question 14

Which of the following best describes Hund's Rule?

Accepted Answer

Electrons occupy degenerate orbitals singly before pairing.

Question 15

Which of the following elements has the highest first ionization energy?

Accepted Answer

Neon (Ne)

Question 16

Which of the following is a correct statement about the emission spectrum of hydrogen?

Accepted Answer

It consists of discrete lines corresponding to specific energy transitions.

Question 17

Which quantum number describes the orientation of an orbital in space?

Accepted Answer

Magnetic quantum number ($$m_l)$$

Question 18

Which of the following best explains why the 2s orbital is lower in energy than the 2p orbital in a multi-electron atom?

Accepted Answer

The 2s orbital is closer to the nucleus and experiences less shielding.

Question 19

Which of the following is the correct order of increasing atomic radius for the elements Na, Mg, and Al?

Accepted Answer

Al \u003c Mg \u003c Na

Quantum Chemistry & Atomic Theory: Waves, Light, and Atomic Structure

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