ps2 - Assignment 2 Due Wednesday 2006 February 22 11:04am...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Assignment 2 PHYSICS 8 . 284 Due Wednesday 2006 February 22 11:04am Reading: Press, Chapter 2, Chapter 3.5 and Chapter 4.1 and 4.2 through 4.2.5 (http://www.lanl.gov/DLDSTP/ay45/ay45toc.html) 1-2. Assume, for the sake of simplicity, that the B filter in the Johnson UBV system has A to 4900 ˚ 100% transmission from 3900 ˚ A , and 0% transmission outside this range. A to 5950 ˚ Assume that the V filter has 100% transmission from 5050 ˚ A . Compute (by numerical integration, using Simpson’s rule with only one interval if you like) the fraction of the total flux emanating in these two idealized passbands from black bodies with each of the following temperatures: a) 10 5 K, b) 35 , 000 K, c) 9700 K, d) 6500 K, e) 4700 K, f) 2600 K. The zero-point of the UBV color system is arbitrary, and was chosen (by Johnson and Morgan) so that an A0 star would have U B = B V = 0. Compute B V colors for the black body temperatures above, choosing your zero point so that a 9700 K black body has B V = 0. Suggestion: In doing numerical integrals it’s often a good idea to take all the di- mensioned constants outside the integral and change variables so that one integrates over a dimensionless variable, e.g. let the variable of integration be x = h /kT or y = hc/θkT . The dimensioned constants set the scale of the
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/26/2012 for the course PHYS 8.284 taught by Professor Rappaport during the Spring '06 term at MIT.

Page1 / 3

ps2 - Assignment 2 Due Wednesday 2006 February 22 11:04am...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online