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Questions and Answers
What is the speed range of the cathode ray particles as determined by Thomson's experiment?
What is the speed range of the cathode ray particles as determined by Thomson's experiment?
- 0.1 to 0.2 times the speed of light (correct)
- More than 0.2 times the speed of light
- Equal to the speed of light
- Less than 0.1 times the speed of light
What did Thomson's observation about the value of e/m being independent of the cathode material or the gas suggest?
What did Thomson's observation about the value of e/m being independent of the cathode material or the gas suggest?
- The need for specific cathode materials for experiments
- The uniqueness of each cathode material
- The variation in e/m based on cathode material
- The universality of the cathode ray particles (correct)
In 1887, what was found about certain metals when irradiated by ultraviolet light?
In 1887, what was found about certain metals when irradiated by ultraviolet light?
- They emitted negatively charged particles with small speeds (correct)
- They remained unchanged
- They emitted positively charged particles
- Their temperature increased significantly
What did the observation about metals emitting negatively charged particles when heated to high temperatures establish?
What did the observation about metals emitting negatively charged particles when heated to high temperatures establish?
What did J.J. Thomson name the negatively charged particles discovered through his experimental investigations?
What did J.J. Thomson name the negatively charged particles discovered through his experimental investigations?
For his discovery of electrons and contributions to the conduction of electricity by gases, in which year was J.J. Thomson awarded the Nobel Prize in Physics?
For his discovery of electrons and contributions to the conduction of electricity by gases, in which year was J.J. Thomson awarded the Nobel Prize in Physics?
What does it mean when the text states that an electron's position uncertainty is infinite?
What does it mean when the text states that an electron's position uncertainty is infinite?
How does a wave packet differ from a wave with a fixed wavelength?
How does a wave packet differ from a wave with a fixed wavelength?
According to de Broglie's relation, what happens to the momentum of an electron associated with a wave packet?
According to de Broglie's relation, what happens to the momentum of an electron associated with a wave packet?
What property of a wave packet allows it to have an uncertainty in both position and momentum?
What property of a wave packet allows it to have an uncertainty in both position and momentum?
How do the concepts of de Broglie relation, Born's probability interpretation, and wave packets relate to Heisenberg's uncertainty principle?
How do the concepts of de Broglie relation, Born's probability interpretation, and wave packets relate to Heisenberg's uncertainty principle?
How does the depiction of an electron as a localised wave packet differ from that of an extended wave with fixed wavelength?
How does the depiction of an electron as a localised wave packet differ from that of an extended wave with fixed wavelength?
Who formulated the laws of refraction in 1621?
Who formulated the laws of refraction in 1621?
When did Huygens propose that light consists of waves?
When did Huygens propose that light consists of waves?
Which model of light was merely a philosophical proposal without scientific experiments or arguments?
Which model of light was merely a philosophical proposal without scientific experiments or arguments?
What did both Descartes and Newton's models of light manage to explain?
What did both Descartes and Newton's models of light manage to explain?
Which scientist extended Descartes' particle model and built it up as a scientific theory?
Which scientist extended Descartes' particle model and built it up as a scientific theory?
What was the speed of light concluded to be by scientists before accurate measurement was possible?
What was the speed of light concluded to be by scientists before accurate measurement was possible?
What does |A|^2∆V represent in the context of matter waves?
What does |A|^2∆V represent in the context of matter waves?
In the context of matter waves, what does a large intensity indicate about the probability of finding a particle?
In the context of matter waves, what does a large intensity indicate about the probability of finding a particle?
What is the formula for de Broglie wavelength of a moving particle?
What is the formula for de Broglie wavelength of a moving particle?
Given an electron moving three times as fast as another particle, what is the ratio of their de Broglie wavelengths?
Given an electron moving three times as fast as another particle, what is the ratio of their de Broglie wavelengths?
What determines the mass of a moving particle in the context of de Broglie wavelength?
What determines the mass of a moving particle in the context of de Broglie wavelength?
When an electron is accelerated through a potential difference, what happens to its de Broglie wavelength?
When an electron is accelerated through a potential difference, what happens to its de Broglie wavelength?
Who discovered double refraction of light in some crystals in 1669?
Who discovered double refraction of light in some crystals in 1669?
What theory did Huygens use to explain the double refraction of light in crystals?
What theory did Huygens use to explain the double refraction of light in crystals?
Which experiment performed in 1801 demonstrated interference fringes and supported the wave theory of light?
Which experiment performed in 1801 demonstrated interference fringes and supported the wave theory of light?
What phenomenon, observed around 1810, could be naturally explained by the wave theory of light?
What phenomenon, observed around 1810, could be naturally explained by the wave theory of light?
Why was Newton’s particle model of light preferred over the wave model for over a century?
Why was Newton’s particle model of light preferred over the wave model for over a century?
What value was determined for the speed of light in vacuum in the nineteenth century through accurate experiments?
What value was determined for the speed of light in vacuum in the nineteenth century through accurate experiments?
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