# Outer Space 10^3 to 10^9

1. Aug 11, 2009

### ania 5555

Please can you help me with these question;

1)Which bonds can be broken by UV radiation in space?

I've done it but I'm not sure if this is correct.
Covalent bond can be broken by UV radiation in space such as; O-O, N-N, C-N, C-C,
C-O, and double pi bond C=C

2)Consider an area (A) of Kapton that is 1cm2. Assume (i) that the flux of AOs (F) is 2.5 x 1020 atoms/cm2/s and (ii) that 3.04 x 10-24 cm3 Kapton is removed per AO (RE: reaction efficiency). Then the rate of loss of film thickness (x) (- dx/dt=A x F x RE) is (3.5x1020 AO/cm2/s) x (3.04 x 10-24 cm3/ AO). What is the rate of Kapton film loss in space? If the film is 1cm thick, how long will it last attack by AOs if the rate remains constant?????
AO- atomic oxygen

3)If the rate of adsorption (dθ/dt) is kax p02 x (1-θ) exp (-Ea/RT) what is the time for a 1m2 window to be covered by O2 at an altitude of 300km above the Earth’s surface?

4)Suggest one object that would be better produced in space than on Earth??

2. Aug 12, 2009

### Redbelly98

Staff Emeritus
Welcome to PF

You'll have to show an attempt at solving HW problems before receiving help (forum policy).

Also, it's better to make a separate thread for each question. If we had a running discussion involving 4 separate problems in one thread, it could get pretty confusing as to who is talking about which problem.

3. Aug 14, 2009

### ania 5555

Re: Outer Space

1) If the rate of adsorption (dθ/dt) is kax p02 x (1-θ) exp (-Ea/RT) what is the time for a 1m2 window to be covered by O2 at an altitude of 300km above the Earth’s surface?

4. Aug 14, 2009

### Redbelly98

Staff Emeritus
Thanks for limiting it to a single question. You'll still have to show your attempt at a solution before receiving help (forum policy).

For more details, scroll down to the Homework Help section here:
https://www.physicsforums.com/showthread.php?t=5374

5. Aug 15, 2009

### tom jones

surrey physical haha

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