2
a)
= angle = 0.04 arcseconds
d = distance
we know that
distance = 1/angle
d = 1/
d = 1/0.04
d = 25 parsec
b)
Bb = brightness of B = 0.0001 x brightness of A = 0.0001 Ba
Bb /Ba = 0.0001
da = distance to A = 25 parsec
db = distance to B
using the equation
d2b/da2 = Ba /Bb
d2b/252 = 1/0.0001
db = 2500 parsec
6 1. A red photon has a wavelength of 660 nm. How fast must a star...
A red emission lone from a star has a wavelength of 650 nm. A) What is the corresponding frequency? B How much energy does each photon at this wavelength carry? Back HW 2.pdf SCIE 223: Astronomy Written Homework 2 due Thursday, November 21, 2019 A red emission line from a star has a wavelength of 650 nm. 1) What is the corresponding frequency? Show your work a. b. How much energy does each photon at this wavelength carry? Show your...
DopplerShift:TheHb(hydrogenbeta)line,whichisstronginthespectraof moderately hot stars, has a wavelength of 486.133 nm in the laboratory (i.e., at rest with respect to the observer). What wavelength (nm) would we observe the Hb line on Earth if it were emitted by a star: a) moving at a speed of 200 km/s toward Earth? b) moving at a speed of 300 km/s away from Earth?