Free Science Courses (from the OU)

Get your science fix here: research, quackery, activism and all the rest
Post Reply
User avatar
Gfamily
Catbabel
Posts: 981
Joined: Mon Nov 11, 2019 1:00 pm

Free Science Courses (from the OU)

Post by Gfamily » Mon Feb 24, 2020 7:06 pm

This might be of interest to people here.
Astronomy with an online telescope
https://www.open.edu/openlearn/ocw/mod/ ... p?id=74591

Lots of others here.

Any take your fancy?
My avatar was a scientific result that was later found to be 'mistaken' - I rarely claim to be 100% correct

User avatar
Boustrophedon
Catbabel
Posts: 752
Joined: Mon Nov 11, 2019 3:58 pm
Location: Lincolnshire Wolds

Re: Free Science Courses (from the OU)

Post by Boustrophedon » Mon Feb 24, 2020 7:37 pm

Some of them look interesting. I did explore the idea of another science degree with the OU, but I was put off by a course structure that gave no credit or leeway for previous experience, I would have basically have had to start by doing an A level style access course first and the expense made it untenable.
...zoologically improbable and/or terrifying to small children.

User avatar
Pucksoppet
Snowbonk
Posts: 534
Joined: Mon Nov 11, 2019 8:13 pm
Location: Girdling the Earth

Re: Free Science Courses (from the OU)

Post by Pucksoppet » Tue Feb 25, 2020 11:28 am

Boustrophedon wrote:
Mon Feb 24, 2020 7:37 pm
Some of them look interesting. I did explore the idea of another science degree with the OU, but I was put off by a course structure that gave no credit or leeway for previous experience, I would have basically have had to start by doing an A level style access course first and the expense made it untenable.
I too was looking forward to using the OU to improve my education, but the course fees put the kibosh on that. I was looking forward to retiring somewhere warm and doing some serious study. Sigh.

MartinDurkin
Buzzberry
Posts: 40
Joined: Mon Nov 11, 2019 5:00 pm

Re: Free Science Courses (from the OU)

Post by MartinDurkin » Wed Mar 04, 2020 11:59 am

Gfamily wrote:
Mon Feb 24, 2020 7:06 pm
This might be of interest to people here.
Astronomy with an online telescope
https://www.open.edu/openlearn/ocw/mod/ ... p?id=74591
Been working my way through this. It's pretty good but the multi choice quizzes are annoying.
1. "Hamal is a magnitude 2.0 star and Al Dhanab has magnitude 3.0. Approximately how many times brighter is Hamal than Al Dhanab?"
My answer of 2.51 marked as wrong. The correct answer is 2.5.

2."In a reflecting telescope the primary element or objective is a X mirror."
Options for X included curved and convex. I answered convex as that was my vague recollection from O level physics but the correct answer is curved. Can anyone explain to me why convex is wrong?

Anyway only a minor irritation as the scores don't count towards anything. In the next lesson we get to play with the COAST telescope in Tenerife.

User avatar
dyqik
Dorkwood
Posts: 1585
Joined: Wed Sep 25, 2019 4:19 pm
Location: Masshole
Contact:

Re: Free Science Courses (from the OU)

Post by dyqik » Wed Mar 04, 2020 1:31 pm

MartinDurkin wrote:
Wed Mar 04, 2020 11:59 am
Gfamily wrote:
Mon Feb 24, 2020 7:06 pm
This might be of interest to people here.
Astronomy with an online telescope
https://www.open.edu/openlearn/ocw/mod/ ... p?id=74591
Been working my way through this. It's pretty good but the multi choice quizzes are annoying.
1. "Hamal is a magnitude 2.0 star and Al Dhanab has magnitude 3.0. Approximately how many times brighter is Hamal than Al Dhanab?"
My answer of 2.51 marked as wrong. The correct answer is 2.5.

2."In a reflecting telescope the primary element or objective is a X mirror."
Options for X included curved and convex. I answered convex as that was my vague recollection from O level physics but the correct answer is curved. Can anyone explain to me why convex is wrong?
Convex means it's curved outwards, and causes incoming parallel rays to diverge. You need a concave mirror for the primary of an imaging optical telescope*.

*Other telescopes are available.

MartinDurkin
Buzzberry
Posts: 40
Joined: Mon Nov 11, 2019 5:00 pm

Re: Free Science Courses (from the OU)

Post by MartinDurkin » Wed Mar 04, 2020 2:04 pm

dyqik wrote:
Wed Mar 04, 2020 1:31 pm

Convex means it's curved outwards, and causes incoming parallel rays to diverge. You need a concave mirror for the primary of an imaging optical telescope*.

*Other telescopes are available.
Haha f.cking hell I triple checked that I had got convex and concave the right way round and still got them confused. Thanks for not calling me a moron.

User avatar
dyqik
Dorkwood
Posts: 1585
Joined: Wed Sep 25, 2019 4:19 pm
Location: Masshole
Contact:

Re: Free Science Courses (from the OU)

Post by dyqik » Wed Mar 04, 2020 2:12 pm

MartinDurkin wrote:
Wed Mar 04, 2020 2:04 pm
dyqik wrote:
Wed Mar 04, 2020 1:31 pm

Convex means it's curved outwards, and causes incoming parallel rays to diverge. You need a concave mirror for the primary of an imaging optical telescope*.

*Other telescopes are available.
Haha f.cking hell I triple checked that I had got convex and concave the right way round and still got them confused. Thanks for not calling me a moron.
concave is hollowed out...

MartinDurkin
Buzzberry
Posts: 40
Joined: Mon Nov 11, 2019 5:00 pm

Re: Free Science Courses (from the OU)

Post by MartinDurkin » Wed Mar 04, 2020 3:35 pm

dyqik wrote:
Wed Mar 04, 2020 2:12 pm
MartinDurkin wrote:
Wed Mar 04, 2020 2:04 pm
dyqik wrote:
Wed Mar 04, 2020 1:31 pm

Convex means it's curved outwards, and causes incoming parallel rays to diverge. You need a concave mirror for the primary of an imaging optical telescope*.

*Other telescopes are available.
Haha f.cking hell I triple checked that I had got convex and concave the right way round and still got them confused. Thanks for not calling me a moron.
concave is hollowed out...
Yeah I used to know that, and I can picture the ray diagram clearly in my mind. My only excuse is that when I did check it the first google hit was this page, https://www.ducksters.com/science/physi ... scopes.php which says
Reflecting telescopes use mirrors instead of lenses to focus the light. A convex mirror is used to gather light and reflect it back to a focal point.
Getting old is no fun.

User avatar
dyqik
Dorkwood
Posts: 1585
Joined: Wed Sep 25, 2019 4:19 pm
Location: Masshole
Contact:

Re: Free Science Courses (from the OU)

Post by dyqik » Wed Mar 04, 2020 4:42 pm

MartinDurkin wrote:
Wed Mar 04, 2020 3:35 pm

Yeah I used to know that, and I can picture the ray diagram clearly in my mind. My only excuse is that when I did check it the first google hit was this page, https://www.ducksters.com/science/physi ... scopes.php which says
Reflecting telescopes use mirrors instead of lenses to focus the light. A convex mirror is used to gather light and reflect it back to a focal point.
Getting old is no fun.
I've just sent them a correction. From my work email address, with my full title in. :D

User avatar
Gfamily
Catbabel
Posts: 981
Joined: Mon Nov 11, 2019 1:00 pm

Re: Free Science Courses (from the OU)

Post by Gfamily » Wed Mar 04, 2020 5:20 pm

dyqik wrote:
Wed Mar 04, 2020 4:42 pm
I've just sent them a correction. From my work email address, with my full title in. :D
Blackboard Monitor Dyqik; tell us you used your Blackboard Monitor Dyqik title :)
My avatar was a scientific result that was later found to be 'mistaken' - I rarely claim to be 100% correct

User avatar
Sciolus
Stargoon
Posts: 121
Joined: Mon Nov 11, 2019 6:42 pm

Re: Free Science Courses (from the OU)

Post by Sciolus » Wed Mar 04, 2020 8:40 pm

MartinDurkin wrote:
Wed Mar 04, 2020 11:59 am
1. "Hamal is a magnitude 2.0 star and Al Dhanab has magnitude 3.0. Approximately how many times brighter is Hamal than Al Dhanab?"
My answer of 2.51 marked as wrong. The correct answer is 2.5.
I don't know if this is what they are thinking, but 2.51 is spurious precision given the magnitudes are only given to two sf. But that's picky.

User avatar
dyqik
Dorkwood
Posts: 1585
Joined: Wed Sep 25, 2019 4:19 pm
Location: Masshole
Contact:

Re: Free Science Courses (from the OU)

Post by dyqik » Wed Mar 04, 2020 11:31 pm

dyqik wrote:
Wed Mar 04, 2020 4:42 pm
MartinDurkin wrote:
Wed Mar 04, 2020 3:35 pm

Yeah I used to know that, and I can picture the ray diagram clearly in my mind. My only excuse is that when I did check it the first google hit was this page, https://www.ducksters.com/science/physi ... scopes.php which says
Reflecting telescopes use mirrors instead of lenses to focus the light. A convex mirror is used to gather light and reflect it back to a focal point.
Getting old is no fun.
I've just sent them a correction. From my work email address, with my full title in. :D
It's fixed now.

Post Reply