- 4. Monochromatic light incident on a slit of width 0.050 mm forms a diffraction pattern on a screen 2.0 m away.The second-order dark fringe is observed at an angle of 1.56^circ . Calculate the wavelength of the light.
- Question 2 (4 points) a) It is estimated that 20% of a certain radioactive substance decays in 30 hours. What is the half life of this substance? b) If tomato juice with a pH of 4.2 is 75 times more acidic as milk what is the pH of milk? (Recall that lower pH's are more acidic!)
- 1. What key discovery did Thomas Young make in the early 1800s, and how did it contribute to the understanding of light? 2. In 1814, what did Joseph Fraunhofer observe in the solar spectrum, and why was it considered a mystery at the time? 3. What was Gustav Kirchhoff's key insight regarding spectral lines, and how did it relate to the absorption and emission of light by elements? 4. What innovation did Wilhelm Crookes contribute to the study of cathode rays,, and how did it impact the understanding of their nature? 5. What was Heinrich Hertz's 1887 discovery related to the photoelectric effect, and why was it significant? 6. What was Max Planck's contribution to the development of quantum theory,and what assumption did he make to explain blackbody radiation? 7. What surprising outcome did the gold foil experiment by Rutherford., Marsden, and Geiger reveal,and how did it lead to the "solar system" model of the atom? 8. How did Albert Einstein explain the photoelectric effect,and what concept did he introduce to support his theory? 9. What did Louis de Broglie propose about the wave-like behavior of particles, and how did this concept challenge existing notions of physics? 10. What was Heisenberg 's Uncertainty Principle, and how did it alter the understanding of measurement in quantum mechanics? 11. What happens to the interference pattern in the double-slit experiment when individual photons or electrons are sent through the slits one at a time? 12. What is the effect of setting up a detector at the slits in the double-slit experiment? 13. What is the primary challenge that physicists face in combining general relativity and quantum physics, and what is the search for a solution called?
- A dead battery can be jump-started or recharged by connecting it to a working battery using jumper cables, why can this process be dangerous? The applied current causes water to evaporate, creating steam The applied current causes water in the dead battery to decompose and produce hydrogen gas and oxygen gas lead may leak out of the battery. sulfuric acid in the battery may leak out
- All battery types have an anode, a cathode and a porous fabric known as a separator. The role of the separator is similar to that of the electrodes salt bridge voltmeter connecting wires
