Question 1

Which of these colors of light has photons of lowest energy?
A) Blue
B) Green
C) Yellow
D) Red

Accepted Answer

Red light has the longest wavelength and therefore the lowest frequency, and since energy is directly proportional to frequency, red light has photons of the lowest energy.

Question 2

The ancient Greek who is known for championing the concept of atom was named ______________.
A) Democritus
B) Socrates
C) Plato
D) Zeus

Accepted Answer

Democritus is the ancient Greek philosopher who is known for championing the concept of atom.

Question 3

What is the energy of a photon with a frequency of 5.2 × 10¹⁴ Hz? A) 3.4 × 10^-19 J B) 1.3 × 10^-20 J C) 0.8 × 10^-20 J D) 0.3 × 10^-21 J

Accepted Answer

The energy of a photon can be calculated using the formula E = hf, where h is Planck's constant (6.626 × 10^-34 J·s) and f is the frequency of the photon. Substituting the given frequency (5.2 × 10^14 Hz) into the formula gives E = (6.626 × 10^-34 J·s)(5.2 × 10^14 Hz) = 3.4452 × 10^-19 J, which rounds to 3.4 × 10^-19 J, matching choice A.

Question 4

Who discovered the nucleus of the atom in 1911?
A) Thomson
B) Rutherford
C) Dalton
D) Bohr

Accepted Answer

Ernest Rutherford discovered the nucleus of the atom in 1911 through the gold foil experiment, where he fired alpha particles at a thin sheet of gold foil and observed that some particles were deflected backwards, indicating the presence of a concentrated, positively charged nucleus in the center of the atom. Thomson discovered the electron and proposed the plum pudding model of the atom in 1897, Dalton proposed the atomic theory in 1803, and Bohr proposed the planetary model of the atom in 1913.

Question 5

According to Planck's hypothesis,the energy of an oscillator is directly proportional to its
A) amplitude.
B) wavelength.
C) momentum.
D) frequency.

Accepted Answer

Planck's hypothesis states that the energy of an oscillator (such as a photon) is directly proportional to its frequency. This is expressed mathematically as E = hf, where E is energy, h is Planck's constant, and f is frequency. The other choices, amplitude, wavelength, and momentum, are not related to Planck's hypothesis.

Question 6

The development of physics since about 1900 is called
A) neoclassical physics.
B) Newtonian physics.
C) classical physics.
D) modern physics.

Accepted Answer

The term "modern physics" refers to the developments in physics since the beginning of the 20th century, including relativity theory, quantum mechanics, nuclear physics and particle physics. This term distinguishes these new branches of physics from the traditional or "classical" physics developed by Isaac Newton in the 17th century.

Question 7

The greater the frequency of light,the greater the ______________ of its photons.
A) velocity
B) speed
C) wavelength
D) energy

Accepted Answer

According to the equation E=hf (where E is energy, h is Planck's constant, and f is frequency), the energy of a photon is directly proportional to the frequency of light. Therefore, the greater the frequency of light, the greater the energy of its photons.

Question 8

The ""billiard ball model" of the atom is associated with
A) Bohr.
B) Thomson.
C) Rutherford.
D) Dalton.

Accepted Answer

The "billiard ball model" of the atom is associated with John Dalton, who proposed that atoms are solid, indivisible spheres, much like billiard balls. This model was one of the earliest to describe the nature of matter.

Question 9

Who discovered the electron in 1897?
A) Dalton
B) Bohr
C) Rutherford
D) Thomson

Accepted Answer

J.J. Thomson discovered the electron in 1897 through his experiments with cathode ray tubes.

Question 10

The number of electrons in an atom of an element is the same as the element's
A) atomic number.
B) period number.
C) mass number.
D) group number.

Accepted Answer

The atomic number of an element is the number of protons in the nucleus of an atom. In a neutral atom, the number of electrons is equal to the number of protons, so the atomic number also gives the number of electrons.

Question 11

Atomic physics deals mainly with phenomena involving which particles in atoms?
A) Quarks
B) Protons
C) Electrons
D) Neutrons

Accepted Answer

Atomic physics deals mainly with phenomena involving electrons in atoms, such as electronic transitions and energy level structure. While protons and neutrons are also present in atoms, they are primarily studied in the field of nuclear physics. Quarks are the subatomic particles that make up protons and neutrons, but they are not directly involved in atomic phenomena.

Question 12

Calculate the frequency in hertz of photons of light with energy of 8.10 × 10^-19 J. A) 0.82 × 10¹⁴ Hz B) 0.82 × 10¹⁵ Hz C) 1.22 × 10¹⁵ Hz D) 1.22 × 10¹⁴ Hz

Accepted Answer

The frequency can be calculated using the equation E = hf, where E is the energy of the photon, h is Planck's constant, and f is the frequency. Solving for f: f = E/h = (8.10 × 10^-19 J) / (6.626 × 10S1U1P934S1S1P-34 Js) = 1.22 × 10¹⁵ Hz. Therefore, the best choice is C.

Question 13

The "plum pudding model" of the atom is associated with
A) Bohr.
B) Rutherford.
C) Dalton.
D) Thomson.

Accepted Answer

The "plum pudding model" of the atom was proposed by J.J. Thomson in 1904. According to this model, the atom consists of a positively charged sphere with negatively charged electrons embedded within it, like plums in a pudding.

Question 14

Removal of an electron from an atom leaves a
A) neutron.
B) positive ion.
C) free quark.
D) negative ion.

Accepted Answer

Removal of an electron leaves the atom with a positive charge, thus creating a positive ion.

Question 15

Which of these colors of light has photons of greatest energy?
A) Red
B) Orange
C) Green
D) Yellow

Accepted Answer

The energy of a photon is directly proportional to its frequency, and the frequency of light increases with decreasing wavelength. Therefore, the color with the shortest wavelength, which is green, has photons with the greatest energy.

Question 16

Aristotle's "continuous" model of matter was proved wrong about 1807 by
A) Bohr.
B) Thomson.
C) Dalton.
D) Rutherford.

Accepted Answer

Dalton's atomic theory, proposed around 1807, refuted Aristotle's continuous model of matter by introducing the concept that matter is composed of discrete, indivisible atoms. This was a fundamental shift from the idea of matter being a continuous substance.

Question 17

Which of these colors of light has photons of lowest energy?
A) Blue
B) Green
C) Yellow
D) Violet

Accepted Answer

Yellow light has photons of lower energy compared to blue, green, and violet. The energy of a photon is inversely proportional to its wavelength; longer wavelengths (such as yellow) have lower energy, and shorter wavelengths (such as violet) have higher energy.

Question 18

Which of these colors of light has photons of greatest energy?
A) Violet
B) Red
C) Blue
D) Yellow

Accepted Answer

Violet has the shortest wavelength among the given colors of light, which means it has the highest frequency and energy of photons. On the other hand, red has the longest wavelength, which means it has the lowest frequency and energy of photons.

Question 19

Which of these colors of light has photons of greatest energy?
A) Green
B) Red
C) Blue
D) Yellow

Accepted Answer

According to the equation E = hf (where E = energy, h = Planck's constant, and f = frequency), photons of higher frequency have greater energy. Blue light has a higher frequency than green, red, or yellow light, so it has the highest energy photons.

Question 20

Addition of an electron to an atom leaves a
A) neutron.
B) positive ion.
C) free quark.
D) negative ion.

Accepted Answer

Adding an electron to an atom results in the atom having one more negatively charged particle than positively charged particles, creating a negative ion.

Quiz 9: Atomic Physics

Which of these colors of light has photons of lowest energy?

The ancient Greek who is known for championing the concept of atom was named ______________.

What is the energy of a photon with a frequency of 5.2 × 1014 Hz?

Who discovered the nucleus of the atom in 1911?

According to Planck's hypothesis,the energy of an oscillator is directly proportional to its

The development of physics since about 1900 is called

The greater the frequency of light,the greater the ______________ of its photons.

The ""billiard ball model" of the atom is associated with

Who discovered the electron in 1897?

The number of electrons in an atom of an element is the same as the element's

Atomic physics deals mainly with phenomena involving which particles in atoms?

Calculate the frequency in hertz of photons of light with energy of 8.10 × 10-19 J.

The "plum pudding model" of the atom is associated with

Removal of an electron from an atom leaves a

Which of these colors of light has photons of greatest energy?

Aristotle's "continuous" model of matter was proved wrong about 1807 by

Which of these colors of light has photons of lowest energy?

Which of these colors of light has photons of greatest energy?

Which of these colors of light has photons of greatest energy?

Addition of an electron to an atom leaves a

What is the energy of a photon with a frequency of 5.2 × 10¹⁴ Hz?

Calculate the frequency in hertz of photons of light with energy of 8.10 × 10^-19 J.