**Please do number 2** Answers for number 1: **Please do number 2** 1. You have

Question

**Please do number 2**

Answers for number 1:

**Please do number 2**

1. You have a CCD with 10 micron pixels which you mount at the prime focus of a telescope with a 1.5 meter diameter, f/4 primary mirror. a. What is the focal length (L) of the telescope? b. How many arcseconds does each pixel subtend on the sky? 2. Your CCD is made of silicon with a band gap of 1.0 eV at your operating temperature. What is the wavelength of the reddest (longest wavelength) photons which are strongly absorbed by the detector?

Explanation / Answer

2)

E = 1 eV

= 1*1.602*10^-19 J

= 1.602*10^-19 J

use:

E = h*c/lambda

1.602*10^-19J =(6.626*10^-34 J.s)*(3.0*10^8 m/s)/lambda

lambda = 1.241*10^-6 m

Answer: 1.24*10^-6 m

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