$KE_{electron} = h\nu_{photon} - \phi$

Question 1

Which property of light is directly related to the energy of a photon according to Planck's equation?

Accepted Answer

Frequency

Question 2

What is the equation that relates the speed of light ($c$), wavelength ($\lambda$), and frequency ($
u$)?

Accepted Answer

$c = \lambda 
u$

Question 3

A photon has a frequency of $6.0 	imes 10^{14}$ Hz. What is its energy in joules? (Use $h = 6.63 	imes 10^{-34}$ J·s)

Accepted Answer

$3.98 	imes 10^{-19}$ J

Question 4

Which of the following best explains why the hydrogen emission spectrum consists of discrete lines rather than a continuous spectrum?

Accepted Answer

Electrons can only occupy specific energy levels, so only certain transitions are possible.

Question 5

If the wavelength of light is doubled, what happens to its frequency, assuming the speed of light remains constant?

Accepted Answer

Frequency is halved.

Question 6

Which color of visible light has the shortest wavelength?

Accepted Answer

Violet

Question 7

What is the principal quantum number ($n$) associated with the ground state of the hydrogen atom?

Accepted Answer

$n = 1$

Question 8

According to the photoelectric effect, what must be true for electrons to be ejected from a metal surface?

Accepted Answer

The photon energy must be greater than the binding energy ($\phi$) of the electron.

Question 9

Which equation describes the kinetic energy of an electron ejected by the photoelectric effect?

Accepted Answer

$KE_{electron} = h
u_{photon} - \phi$

Question 10

Which of the following statements about the dual nature of light is correct?

Accepted Answer

Light exhibits both wave-like and particle-like properties.

Question 11

What happens when an electron in a hydrogen atom moves from a higher energy orbit to a lower energy orbit?

Accepted Answer

The electron emits energy as a photon.

Question 12

Which region of the electromagnetic spectrum has the highest energy?

Accepted Answer

Gamma rays

Question 13

A metal surface ejects electrons when struck by yellow light. What will happen if the surface is struck with ultraviolet light?

Accepted Answer

Electrons would be ejected, and they would have higher kinetic energy than those ejected by yellow light.

Question 14

Which scientist proposed that electromagnetic radiation comes in quantized units called quanta?

Accepted Answer

Max Planck

Question 15

What is the relationship between wavelength and frequency for electromagnetic radiation?

Accepted Answer

They are inversely related.

Question 16

Which of the following is NOT a property of electromagnetic waves?

Accepted Answer

They possess mass.

Question 17

What is the span of visible wavelengths in the electromagnetic spectrum?

Accepted Answer

400 nm to 700 nm

Question 18

Which process explains the emission of light when an electron falls from a higher energy orbit to a lower energy orbit in Bohr's model?

Accepted Answer

Emission of a photon

Question 19

What is the term for the lowest energy state of an atom?

Accepted Answer

Ground state

Question 20

Which of the following best describes the photoelectric effect?

Accepted Answer

Electrons are ejected from a metal surface when struck by light of sufficient frequency.

Quantum-Mechanical Model of the Atom: Electromagnetic Radiation, Photons, and Bohr's Model

Study Guide - Practice Questions