Podcast
Questions and Answers
Why did Thomson propose that the particles he observed must be negatively charged?
Why did Thomson propose that the particles he observed must be negatively charged?
- Because they were heavier than atoms.
- Because they were distinguishable based on the source material.
- Because they attracted negative charges and repelled positive charges.
- Because they attracted positive charges and repelled negative charges. (correct)
How did Millikan determine the charge on individual oil droplets in his 'oil drop' experiments?
How did Millikan determine the charge on individual oil droplets in his 'oil drop' experiments?
- By using X-rays to charge the droplets.
- By adjusting the electric field strength and making calculations. (correct)
- By measuring the mass of the droplets.
- By adjusting the temperature of the apparatus.
What fundamental charge value did Millikan conclude from his oil drop experiments?
What fundamental charge value did Millikan conclude from his oil drop experiments?
- 1.6 × 10^-19 C (correct)
- 2.0 × 10^19 C
- -1.6 × 10^-19 C
- -1.0 × 10^-19 C
According to Thomson, what model of atoms proposed a positively charged mass with an equal amount of negative charge in the form of embedded electrons?
According to Thomson, what model of atoms proposed a positively charged mass with an equal amount of negative charge in the form of embedded electrons?
What type of particles did Rutherford use in his experiment with gold foil?
What type of particles did Rutherford use in his experiment with gold foil?
What was the main observation made by Rutherford and his colleagues when they directed alpha particles at gold foil?
What was the main observation made by Rutherford and his colleagues when they directed alpha particles at gold foil?
What did English physicist J.J. Thomson discover using a cathode ray tube?
What did English physicist J.J. Thomson discover using a cathode ray tube?
What type of beam appeared when high voltage was applied across the electrodes in the cathode ray tube?
What type of beam appeared when high voltage was applied across the electrodes in the cathode ray tube?
In Thomson's experiments, how was the cathode ray deflected in the presence of an applied magnetic field?
In Thomson's experiments, how was the cathode ray deflected in the presence of an applied magnetic field?
What allowed Thomson to calculate the charge-to-mass ratio of the cathode ray particles?
What allowed Thomson to calculate the charge-to-mass ratio of the cathode ray particles?
What was significant about the beam produced in the cathode ray tube when different metals were used for the electrodes?
What was significant about the beam produced in the cathode ray tube when different metals were used for the electrodes?
What were scientists interested in investigating in the late 1800s related to atoms?
What were scientists interested in investigating in the late 1800s related to atoms?
What did Rutherford deduce about the structure of the atom from his experiment with alpha particles?
What did Rutherford deduce about the structure of the atom from his experiment with alpha particles?
Why did Rutherford's alpha particles get deflected when passing through the gold foil?
Why did Rutherford's alpha particles get deflected when passing through the gold foil?
What did Frederick Soddy discover that led to the concept of isotopes?
What did Frederick Soddy discover that led to the concept of isotopes?
What component of an atom did James Chadwick discover in 1932?
What component of an atom did James Chadwick discover in 1932?
Why were the nuclei of other elements found to contain isotopes?
Why were the nuclei of other elements found to contain isotopes?
What did Rutherford propose was at the center of each atom based on his experiments?
What did Rutherford propose was at the center of each atom based on his experiments?
Why did Rutherford compare the deflection of alpha particles to firing a shell at tissue paper?
Why did Rutherford compare the deflection of alpha particles to firing a shell at tissue paper?
What was the significance of discovering isotopes in early 1900s chemistry?
What was the significance of discovering isotopes in early 1900s chemistry?
What did Thomson propose about the particles he observed based on their interaction with charges?
What did Thomson propose about the particles he observed based on their interaction with charges?
How did Millikan determine the charge on individual oil droplets in his experiments?
How did Millikan determine the charge on individual oil droplets in his experiments?
What did George Stoney coin the term 'electron' from?
What did George Stoney coin the term 'electron' from?
What model of atoms did Thomson propose in 1904?
What model of atoms did Thomson propose in 1904?
What was the next major development in understanding the atom after Thomson's 'plum pudding' model?
What was the next major development in understanding the atom after Thomson's 'plum pudding' model?
What type of beam appeared between the electrodes in J.J. Thomson's cathode ray tube experiments?
What type of beam appeared between the electrodes in J.J. Thomson's cathode ray tube experiments?
How did the cathode ray particles behave when different metals were used for the electrodes in Thomson's experiments?
How did the cathode ray particles behave when different metals were used for the electrodes in Thomson's experiments?
What allowed J.J. Thomson to calculate the charge-to-mass ratio of the cathode ray particles?
What allowed J.J. Thomson to calculate the charge-to-mass ratio of the cathode ray particles?
What did J.J. Thomson observe about the behavior of the cathode ray in relation to positive and negative charges?
What did J.J. Thomson observe about the behavior of the cathode ray in relation to positive and negative charges?
Which aspect of J.J. Thomson's experiments led to the most significant discovery about matter in the late 1800s?
Which aspect of J.J. Thomson's experiments led to the most significant discovery about matter in the late 1800s?
What did Rutherford deduce from the fact that most alpha particles passed through gold atoms undeflected?
What did Rutherford deduce from the fact that most alpha particles passed through gold atoms undeflected?
What conclusion did Rutherford draw about the volume occupied by an atom from his experiments with alpha particles?
What conclusion did Rutherford draw about the volume occupied by an atom from his experiments with alpha particles?
What led Frederick Soddy to realize the existence of isotopes?
What led Frederick Soddy to realize the existence of isotopes?
What did James Chadwick's discovery of neutrons help explain about isotopes?
What did James Chadwick's discovery of neutrons help explain about isotopes?
How did Rutherford's model propose an atom is structured?
How did Rutherford's model propose an atom is structured?
What led Rutherford to propose a model in which an atom consists of a very small, positively charged nucleus surrounded by negatively charged electrons?
What led Rutherford to propose a model in which an atom consists of a very small, positively charged nucleus surrounded by negatively charged electrons?
What crucial discovery led Frederick Soddy to realize that an element could have types of atoms with different masses but that were chemically indistinguishable?
What crucial discovery led Frederick Soddy to realize that an element could have types of atoms with different masses but that were chemically indistinguishable?
What subatomic particle did James Chadwick discover in 1932 that helped explain the existence of isotopes?
What subatomic particle did James Chadwick discover in 1932 that helped explain the existence of isotopes?
What did Rutherford compare the deflection of alpha particles to in order to convey the incredibility of the event he observed?
What did Rutherford compare the deflection of alpha particles to in order to convey the incredibility of the event he observed?
What did Rutherford deduce about the volume occupied by an atom from his experiments with alpha particles?
What did Rutherford deduce about the volume occupied by an atom from his experiments with alpha particles?
