Recent content by yiuscott

Hello I was just wondering if anyone (particularly people who went to UK universities) can share some of the interview questions or interview tips you experienced when applying for physics in university? This is because I will be applying through UCAS in around 2 months and would like to get...

Thanks for the reply. lol thanks. I can't imagine a textbook getting 2 questions wrong in a row. I should have spotted the problem with a 228K Earth though... :rolleyes:

Homework Statement This is the questions: 1) The angular diameter of the sun measured from the Earth is 0.52 degrees. Calculate: i) the angular diameter in radians ii) the sun's radius in meters iii) The surface area of the sun, assuming that it is a sphere 2) Using L=aAT4 where L is...

I was just looking around on wikipedia and found out that it says that high energy neutrons are easily absorbed by U238. I am guessing the reason that they put the low energy neutrons is to stop the neutrons from being absorbed by the U238... Is this a correct guess? if so why do high energy...

My textbook said that only lower energy neutrons (around 1ev) favor Uranium fission while higher energy neutrons don't. Is there an explanation for this. ( i don't think we are required to know it for the course but I'm just interested...) Thanks.

Thank you for the reply. X is my velocity and y is the depth of the crater. I didn't realize that the number in front was to do with the material. :redface: Thanks!

Homework Statement We have to do a project on finding out the relationship of velocity of the impact to crater depth by experimental methods, then we are supposed to find out the answer on the internet and compare it without experimental results. However, i couldn't find any website that wrote...

I took this photo of Jupiter using a Nikon D60 by prime focus through a Orion Skyview Pro 6.

Thanks for your reply I went into registax and randomly played with the wavelet filter bars, and the resultant image is actually better than before (picture attached below). I would like to ask if there is a definite setting that i should use for the wavelet filiter or is it trail and error?

I would also like to ask if 0.5seconds is the correct shutter speed for saturn? Does stacking two 0.25 seconds photo make the photo 0.5 seconds?

I read from a website that using prime focus, the magnification is around your focal length divided by 50. Thats 750/50=15 for me. Even with a 2X barlow, that's only 30X. I don't think you can actually see saturn that well with 30X. Does this mean I have to get a 10X barlow lens or something? Or...

I just placed the camera to the eyepiece (I think its called the afocal method, but i am not too sure...). But i used a 2X barlow and a 5mm eyepiece. The camera i used was a normal digital camera for daily use (lumix fx8). I can't really pull the lenses off the digital camera, does this mean...

Thank You for the reply. I did stack around 200 frames to get this. But am i allowed to have extra magnification? I thought the therotical maximum limit to a 6" telescope is 300X magnification. I tried looking through 600X and it looks slightly blur.

Thank you for the reply. I used registax as you suggested (aligned and stacked some pictures together). Below is the picture of saturn after registax. The image certainly looks better than before but is still much inferior than other 6" pictures. I can see good quality images from my...

In order to stack lots of frames, the saturn must stay in the same spot within my eyepiece? So do i need a RA motor for that?