# GCSE OCR 21st Century Triple Science (CBP1-7) ThreadWatch

4 years ago
#3021
(Original post by Sulfur)
You got 2.77AU!?!? How lol, I thought it was that double and +4 and then divide by 10 pattern, and the previous was 12, double it is 24, +4 /10 is 28/10 = 2.8AU

Travels 1800 km/s
Speed is 71 km/s per Mpc
Distance: ? (1800/71) Final units: Mpc
Yup, lol! I did that but I was talking about the question where it asked whether this star fitted into the pattern or not. That was 2.77AU so I said it was relatively close to 2.8AU so fit the pattern
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4 years ago
#3022
(Original post by meessime)
Huh? What was the first question?
Asking us to explain why there was only data for 6 planets, I think..
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4 years ago
#3023
Asking us to explain why there was only data for 6 planets, I think..
Oh I did that wrong then, I wrote something like it's to make sure there's a pattern to prove that titius-bole law is right...:
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#3024
Yup, lol! I did that but I was talking about the question where it asked whether this star fitted into the pattern or not. That was 2.77AU so I said it was relatively close to 2.8AU so fit the pattern
Ah yes! Good I put that

Asking us to explain why there was only data for 6 planets, I think..
What was the answer? I said that people could only see them planets with the naked-eye, had no idea.
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4 years ago
#3025
What did people get for the sun and how long it'd take to run out of energy or something?

I did overall mass(given in question i think)/mass lost per second of the previous star question(it said they had similar luminosity)?
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4 years ago
#3026
(Original post by Sulfur)
Ah yes! Good I put that

What was the answer? I said that people could only see them planets with the naked-eye, had no idea.
I read over the question and it said something about 1504 so I figured they hadn't been discovered yet It fit in with the next couple of questions where it gave data for Neptune, Uranus & Pluto because it said data was only collected at like 1804?
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4 years ago
#3027
(Original post by Sulfur)

What was the answer? I said that people could only see them planets with the naked-eye, had no idea.
That's what i put but i was just thinking how are they recording any of this data by naked eye then!
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4 years ago
#3028
(Original post by lyricalvibe)
What did people get for the sun and how long it'd take to run out of energy or something?

I did overall mass(given in question i think)/mass lost per second of the previous star question(it said they had similar luminosity)?
I never did that.. I worked out the energy with E=mc^2 with the mass they gave us. Then divided it with my answer from the previous question (mass lost,
methinks) because it said ''this much mass is lost in 1 second''.

It was such a weird question. I reckon grade boundaries will drop to 36 = A* tbh..
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4 years ago
#3029
Phew I thought I did badly in this exam until I read what everyone else put down for some of the dodgy questions
Overall it wasn't a bad paper, would have preferred more calculations but the 6 markers were nice.
Woop end of exams!!

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4 years ago
#3030
I never did that.. I worked out the energy with E=mc^2 with the mass they gave us. Then divided it with my answer from the previous question (mass lost,
methinks) because it said ''this much mass is lost in 1 second''.

It was such a weird question. I reckon grade boundaries will drop to 36 = A* tbh..
Yh, i know, completely out of spec -_- but i spent my last 5mins answering it :/ my school odly found it easy but most people want C or B so I'm thinking it'll go up for the C grade and down for the A*, 35-37 i think so basically what yousaid

What did you put for the lenses and refraction?
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#3031
I read over the question and it said something about 1504 so I figured they hadn't been discovered yet It fit in with the next couple of questions where it gave data for Neptune, Uranus & Pluto because it said data was only collected at like 1804?
(Original post by lyricalvibe)
That's what i put but i was just thinking how are they recording any of this data by naked eye then!
Hmm yup I see both points. I've just looked it up and they were discovered a bit later (1700-1800s) but surely the fact that they can't be seen by the naked eye also works, hence they couldn't be discovered until Galileo? This is why I hate OCR... if they allowed multiple answers then I'd be happy.
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4 years ago
#3032
I've got 2 hours of statistics nowv then I'm done with exams though
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#3033
(Original post by lyricalvibe)
Yh, i know, completely out of spec -_- but i spent my last 5mins answering it :/ my school odly found it easy but most people want C or B so I'm thinking it'll go up for the C grade and down for the A*, 35-37 i think so basically what yousaid

What did you put for the lenses and refraction?
Didn't they repeat that lens question from last year?

You use an objective lens because it has a greater aperture than the wavelength so it collects more light radiation, that means that there's less diffraction and the eyepiece has more power so it creates a clearer image?
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4 years ago
#3034
(Original post by Sulfur)
Can you remember it? I'll try and answer.
Why are there only 6 planets? Something like that.
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#3035
(Original post by JazzyT17)
Why are there only 6 planets? Something like that.
Ah yup (just been answered on this page/page before - to do with discovery or not being seen with naked-eye)
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4 years ago
#3036
What did everyone put for the space telescopes 6 marker?

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#3037
What was the question about astronomers observing distant galaxies and confidence? What did people put?
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4 years ago
#3038
(Original post by Sulfur)
What was the question about astronomers observing distant galaxies and confidence? What did people put?
I said things about peer review and how other astronomers need to calculate it to prove the claim is true etc
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4 years ago
#3039
(Original post by olmyster911)
What did everyone put for the space telescopes 6 marker?

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I put the advantages of space telescopes compared to ground based telescopes e.g can absorb more wavelengths of EM radiation and can avoid cloudy nights and atmospheric refraction etc etc and said that since we can collect more radiation it leads to bright images and clearer, sharper images are produced which helps with our accuracy of calculations of parallax. For the cepheid variables part, i put that since we have to measure period, luminosity and observed brightness to calculate distance, it means that the brighter the image, the easier it is for us to determine the distance etc. I also said that since our parallax measurements are more accurate, you can essentially compare the two measurements (parallax and cepheid) to double check the distances and calculations
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4 years ago
#3040
(Original post by Magnesium)
I put the advantages of space telescopes compared to ground based telescopes e.g can absorb more wavelengths of EM radiation and can avoid cloudy nights and atmospheric refraction etc etc and said that since we can collect more radiation it leads to bright images and clearer, sharper images are produced which helps with our accuracy of calculations of parallax. For the cepheid variables part, i put that since we have to measure period, luminosity and observed brightness to calculate distance, it means that the brighter the image, the easier it is for us to determine the distance etc. I also said that since our parallax measurements are more accurate, you can essentially compare the two measurements (parallax and cepheid) to double check the distances and calculations
You said lots more points than me, that actually answered the question xD

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