Particle Accelerators and Detectors
A charged particle in a 2.0-T magnetic field is bent in a circle of radius 75 cm. What is the momentum of the particle?
A. easuring and Comparing Stars 1. The apparent brightness of a star is determined by distance and intrinsic brightness (luminosity) a) luminosity- measure brightness, distance, and calculate the luminosity 2. Parallax- the shift with respect to the background objects a) depth erception comes from s tereoscopic v ision b) The greater the arallax the smaller t he istance. 1)The parallaxes of r eal stars ar iny c) make two easurements, 6 months part 3. Angular separation- p(arcsec)= 1/d(parsec) a) parsec 3.26 light years 4. Luminosity- the amount of light emitted by an object a) tar’s intrinsic brightness 1) a dim star could have a low luminosity or be far away; a bright star could be close r have a high luminosity b) Surface temperature of stars- use Wien’s law 0.29cm*K/t(k) 1) The Stefan Boltzmann law hotter blackbody emits more radiation at every w avelength than does a cooler blackbody (a)