Introduction to Astrophysics 0321.3108 Exercise 6
1. Measurements of the radial recession velocities of five galaxies in a cluster give velocities of 9700, 8600, 8200, 8500, and 10,000 km s -1 . a. What is the distance to the cluster if the Hubble paramet
Introduction to Astrophysics 0321.3108 Problems Set
1 gr 1. The virial theorem states that for a star in hydrostatic equilibrium < P >= - 3 V , where < P > is the volume average pressure, V is the volume, and E gr is the gravitational potential energy. E
INTRODUCTION TO ASTROPHYSICS
Prof. Amiel Sternberg [email protected]
Teaching Assistant: Ms. Smadar Naoz [email protected] This course is an introduction to astrophyiscs for 3rd year undergraduate Physics students. Textbooks: Basic Astrophysics by
Introduction to Astrophysics 0321.3108 Exercise 5
1. Nuclear reactions occur when nuclei are within range of the "strong nuclear force", i.e., "strong interactions". In the first step of the p-p chain one proton is transformed to neutron. The reaction is
Introduction to Astrophysics 0321.3108 Exercise 4
1. For radiation we know that the pressure is P = u/3 where u is the radiation energy density. Assume that u is a function of the temperature only, i.e. u = u(T ) (this fact was discovered by Kirchoff). a.
Introduction to Astrophysics 0321.3108 Exercise 1
1. a. Calculate the best angular resolution that can, in principle, be achieved with the human eye. Assume a pupil diameter of 0.5 cm and the wavelength of green light, 0.5m. Express your answer in arcminu
Introduction to Astrophysics 0321.3108 Exercise 2
1. The maximal radial velocities measured for the two components of a spectroscopic binary are 100 km s-1 and 200 km s-1 , with an orbital period of 2 days. The orbits are circular. a. Find the mass ratio
Introduction to Astrophysics 0321.3108 Exercise 3
1. In class we showed that in thermal equilibrium N (H + ) 1 = N (H) N (e) 2me kB T h2
3/2
exp
-1.6 105 T
,
(1)
where N (H + ) is the proton number density, N (H) is the atomic hydrogen number density, N (