Question 1

Which equation correctly relates the speed of light ($$c$$), wavelength ($$\lambda$$), and frequency ($$
u) of $$electromagnetic radiation?

Accepted Answer

$$c = \lambda 
u$$

Question 2

A sodium lamp emits yellow light with a frequency of $$5.09 	imes 10$$^{14}$$ Hz. What is the wavelength of this light in meters? (Speed of light c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$5.90 	imes 10$$^{-7}$$ m

Question 3

Which of the following best describes the Bohr model of the atom?

Accepted Answer

Electrons occupy distinct energy levels and can move between them by absorbing or emitting energy.

Question 4

What is the energy of a photon with a frequency of $$3.20 	imes 10$$^{11}$$ Hz? (Planck's constant h = 6.626$$ 	imes $$10^{-34} J$$·s)

Accepted Answer

$$2.12 	imes 10$$^{-22}$$ J

Question 5

Which quantum number determines the shape of an atomic orbital?

Accepted Answer

Angular momentum quantum number ($$l)$$

Question 6

A hydrogen atom emits a photon as an electron transitions from $$n=3 to$$ $$n=2. $$What happens to the energy of the atom?

Accepted Answer

The atom loses energy and emits light.

Question 7

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

Accepted Answer

Gamma rays have higher frequencies and shorter wavelengths than visible light.

Question 8

Which rule states that electrons fill the lowest energy orbitals first?

Accepted Answer

Aufbau Principle

Question 9

What is the maximum number of electrons that can occupy the $$p$$ sublevel in a given energy level?

Accepted Answer

6

Question 10

Which phenomenon provides evidence for the wave-like nature of electrons?

Accepted Answer

Electron diffraction patterns

Question 11

A photon of light has a wavelength of $$260 nm. $$What is its energy in joules? ($$h = 6.626 	imes 10$$^{-34}$$ J·s, c = 3.00$$ 	imes $$10^8 m/s)$$

Accepted Answer

$$7.64 	imes 10$$^{-19}$$ J

Question 12

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

Accepted Answer

Magnetic quantum number ($$m_l)$$

Question 13

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 14

A flame test produces a green color. Which element is most likely present?

Accepted Answer

Copper (Cu)

Question 15

Which of the following best explains why atomic emission spectra are unique for each element?

Accepted Answer

Each element has a unique arrangement of energy levels.

Question 16

If an electron in a hydrogen atom moves from $$n=5 to$$ $$n=2$$, what type of electromagnetic radiation is most likely emitted?

Accepted Answer

Visible light

Question 17

Which quantum number is responsible for the 'spin' of an electron?

Accepted Answer

Spin quantum number ($$m_s)$$

Question 18

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

Accepted Answer

It only accurately describes atoms with one electron.

Question 19

Which rule states that electrons will fill degenerate orbitals singly before pairing up?

Accepted Answer

Hund's Rule

Question 20

A student observes a bright yellow emission line in a flame test. Which element is most likely responsible for this observation?

Accepted Answer

Sodium (Na)

Electrons in Atoms: Quantum Theory, Energy Levels, and Atomic Spectra

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