Draw a ray trace diagram showing the image location for a 5 cm tall object placed 8 cm away from a converging lens that has a focal length of 10 cm. is this image real or virtual? upright or inverted? smaller or larger than the original object? 18. a slit of width 0.11 mm is cut in a sheet of metal and illuminated with light from a mercury vapor lamp with a wavelength of 577 nm. a screen is placed 4 meters from the slit. find the width of the central peak in the diffraction pattern in meters on the screen, i. e. find the distance between the first minima on the left and the first minima on the right. 19. it used to be said that the us had spy satellites could read license plates from space. assuming that the altitude of the spy satellite is 200 km above the earth and it needs to be able to resolve points 5 cm apart to read the letters, what should the diameter of the mirror be to achieve this feat? ignore any blurring from the atmosphere and assume diffraction limited optics. 20. suppose than an electron in hydrogen has been excited to the n=3 state. what two wavelength of light would be emitted if the electron fell from the n-3 to n-2 state, then fell from the n=2 down to the ground state? give your answers in nm. is either one of the photons in the visible? which transition if so?

26.4 is about the right time

  sequence  is a continuous and distinctive band of  stars  that appears on plots of stellar  color  versus  brightness. these color-magnitude plots are known as  hertzsprung–russell diagramsafter their co-developers,  ejnar hertzsprungand  henry norris russell. stars on this band are known as  main-sequence stars  or  dwarf stars. these are the most numerous true stars in the universe, and include the earth's  sun.after condensation and ignition of a star, it generates  thermal energy  in its dense core region through  nuclear fusion  of  hydrogen  into  helium. during this stage of the star's lifetime, it is located on the main sequence at a position determined primarily by its mass, but also based upon its chemical composition and age. the cores of main-sequence stars are in  hydrostatic equilibrium, where outward thermal pressure from the hot core is balanced by the inward pressure of  gravitational collapse  from the overlying layers. the strong dependence of the rate of energy generation on temperature and pressure to sustain this balance. energy generated at the core makes its way to the surface and is radiated away at the  photosphere. the energy is carried by either  radiation  or  convection, with the latter occurring in regions with steeper temperature gradients, higher opacity or both.the main sequence is sometimes divided into upper and lower parts, based on the dominant process that a star uses to generate energy. stars below about 1.5 times the  mass of the sun  (1.5  m☉) primarily fuse hydrogen atoms together in a series of stages to form helium, a sequence called the  proton–proton chain. above this mass, in the upper main sequence, the nuclear fusion process mainly uses atoms of  carbon,  nitrogen  and  oxygen  as intermediaries in the  cno cycle  that produces helium from hydrogen atoms. main-sequence stars with more than two solar masses undergo convection in their core regions, which acts to stir up the newly created helium and maintain the proportion of fuel needed for fusion to occur. below this mass, stars have cores that are entirely radiative with convective zones near the surface. with decreasing stellar mass, the proportion of the star forming a convective envelope steadily increases. main-sequence stars below 0.4  m☉undergo convection throughout their mass. when core convection does not occur, a helium-rich core develops surrounded by an outer layer of hydrogen.in general, the more massive a star is, the shorter its lifespan on the main sequence. after the hydrogen fuel at the core has been consumed, the star  evolves  away from the main sequence on the hr diagram, into a  supergiant,  red giant, or directly to a  white dwarf.

You will hear a hissing sound because of the carbon dioxide escaping the can or bottle