Endocrinology 1: Pituitary Gland
(Anterior or Posterior?) pituitary is a part of the nervous system and consists of non-myelinated axons and nerve terminals from neurons in the hypothalamus (neural tissue)
Two slits with a separation of 8.5×10−5 m create an interference pattern on a screen 2.3 m away. Suppose we change the slit separation to a value other than 8.5×10−5 m, with the result that the linear distance to the tenth bright fringe above the central bright fringe increases from 12 cm to 18 cm. The screen is still 2.3 m from the slits, and the wavelength of the light is 440 nm. Find the new slit separation.
Many of the stars in the sky are actually binary stars, in which two stars orbit about their common center of mass. If the orbital speeds of the stars are high enough, the motion of the stars can be detected by the Doppler shifts of the light they emit. Stars for which this is the case are called spectroscopic binary stars. Figure we saw earlier shows the simplest case of a spectroscopic binary star: two identical stars, each with mass m, orbiting their center of mass in a circle of radius R. The plane of the stars' orbits is edge-on to the line of sight of an observer on the earth. (b) The light from each star in the binary system varies from its maximum frequency to its minimum frequency and back again in 11.0 days. Determine the orbital radius R and the mass m of each star. Give your answer for m in kilograms and as a multiple of the mass of the sun, 1.99×1030 kg. Compare the value of R to the distance from the earth to the sun. 1.50×1011 m. (This technique is actually used in astronomy to determine the masses of stars. In practice, the problem is more complicated because the two stars in a binary system are usually not identical, the orbits are usually not circular, and the plane of the orbits is usually tilted with respect to the line of sight from the earth.)