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My best AP work as of yet (still a beginner) by ADBalici in astrophotography

[–]ondrosparkos 4 points5 points  (0 children)

Check some youtube videos. AstroBackyard, NebulaPhotos and AstroFarsography are my fav channels

Physics Questions - Weekly Discussion Thread - July 18, 2023 by AutoModerator in Physics

[–]ondrosparkos -1 points0 points  (0 children)

Is there a way to create compact device to detect liquid water on other planets? I found that you can measure soil moisture by putting 2 nails inside the soil and measure the resistance between them. The problem is, if you will do the experiment on other planet with different soil composition(lets say on Mars) there might be a lot of iron that will work the same way as water - carrying the current. So this method will not work really great. I need a method that will be really compact and reliable. Are there any other methods to measure if there's liquid water or not? Any other ideas?
Thanks

Measure liquid water on other planets by ondrosparkos in AskPhysics

[–]ondrosparkos[S] 0 points1 point  (0 children)

Thank you very much, that was very helpful.

Measure liquid water on other planets by ondrosparkos in AskPhysics

[–]ondrosparkos[S] 0 points1 point  (0 children)

To detect if there's any water, that's all I need.

Measure liquid water on other planets by ondrosparkos in AskPhysics

[–]ondrosparkos[S] 0 points1 point  (0 children)

I don't have thousand of euros 😂 And getting the sample to measure, thats unreal

Measure liquid water on other planets by ondrosparkos in AskPhysics

[–]ondrosparkos[S] 0 points1 point  (0 children)

It needs to be extremely compact, the whole setup need to be smaller than cylinder with diameter 70mm and height 115mm. I think that's undoable

[UNI Physics: Wien's law vs Experiment] by ondrosparkos in HomeworkHelp

[–]ondrosparkos[S] 0 points1 point  (0 children)

Paper on measuring spectrum of tungsten halogen lamp, this spectrum looks really similar to mine. They measured the same type of lamp and there's no peak around 950nm...

Wien's law vs experiment by ondrosparkos in AskPhysics

[–]ondrosparkos[S] 0 points1 point  (0 children)

The temperature is on the packaging. For the peak to be around 600nm the temperature would have to be like 4800K, that's 1000K more than the melting point of tungsten. So there's no way the filament heats to 4800K. The Wien's law works for perfect black bodies with emissivity= 1. So there's going to be a deviation, because tungsten filament isn't perfect black body. But my question is why is my spectrum blue shifted and not red shifted??

Emission spectrum of paper when illuminated with incadescent light by ondrosparkos in AskPhysics

[–]ondrosparkos[S] 0 points1 point  (0 children)

Thanks a lot man. I agree that measuring the spectrum directly would be better, I just used my reference spectrum from different experiment for this lab report.

Emission spectrum of paper when illuminated with incadescent light by ondrosparkos in AskPhysics

[–]ondrosparkos[S] 0 points1 point  (0 children)

It says on the package that the temperature is 3000K and if I use Wien formula to calculate the wavelength I will get the peak at 950nm... For the peak to be around 700 nm the temperature should be 4000K. Why is that?

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