Question 1

Which of the following best describes the relationship between the energy of a photon and its wavelength in the electromagnetic spectrum?

Accepted Answer

$$E = \dfrac{hc}{\lambda},\ where\ E\ is\ energy,\ h\ is\ Planck's\ constant,\ c\ is\ the\ speed\ of\ light,\ and\ \lambda\ is\ wavelength$$

Question 2

Which experiment provided evidence for the quantization of energy in atoms and led to the development of the Bohr model?

Accepted Answer

The atomic emission spectrum of hydrogen

Question 3

According to the Bohr model, what happens when an electron in a hydrogen atom transitions from $$n=4 to$$ $$n=2$$?

Accepted Answer

The atom emits a photon with energy equal to the difference between the two levels.

Question 4

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 5

A photon with a wavelength of $$400\ nm is $$incident on a metal surface. If the work function of the metal is $$2.5\ eV$$, will electrons be ejected from the surface? (Use $$h = 6.626 	imes 10$$^{-34}$$\ J\cdot s$$, $$c = 3.00 	imes 10^8$\ m/s$$, $$1\ eV = 1.602 	imes 10$$^{-19}$$\ J)$$

Accepted Answer

Yes, because the energy of the photon is greater than the work function.

Question 6

Which property of light is explained by the photoelectric effect?

Accepted Answer

Light exhibits particle-like properties, as energy is quantized in photons.

Question 7

Which set of quantum numbers is not allowed for an electron in an atom?

Accepted Answer

$$n=2,\ l=2,\ m_l=0,\ m_s=+\dfrac{1}{2}$$

Question 8

Which of the following statements about the electromagnetic spectrum is correct?

Accepted Answer

Gamma rays have higher energy than visible light.

Question 9

Which equation correctly represents the energy levels of the hydrogen atom according to the Bohr model?

Accepted Answer

$$E_n = -13.6\ eV / n^2$

Question 10

Which of the following best explains why only certain colors are observed in the atomic emission spectrum of hydrogen?

Accepted Answer

Electrons transition between discrete energy levels, emitting photons of specific energies.

Question 11

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

Accepted Answer

Magnetic quantum number ($$m_l)$$

Question 12

A sodium street lamp emits light at a wavelength of $$589\ nm. $$What is the frequency of this light? (Use $$c = 3.00 	imes 10^8$\ m/s)$$

Accepted Answer

$$5.09 	imes 10$$^{14}$$\ Hz$$

Question 13

Which of the following is a limitation of the Bohr model of the atom?

Accepted Answer

It cannot explain the spectra of atoms with more than one electron.

Question 14

Which property of electrons is described by the spin quantum number ($$m_s$$)?

Accepted Answer

The direction of the electron's intrinsic angular momentum

Question 15

Which of the following best describes the shape of a $$p$$ orbital?

Accepted Answer

Dumbbell-shaped

Quantum Theory of the Atom: Study Notes (Ch. 8)

Study Guide - Practice Questions

Study Guide - Flashcards