ialfighter2020
Badges: 9
Rep:
?
#1
Report Thread starter 1 year ago
#1
I am not so sure about the following physics MC. Might anyone provide a detailed explanation. Thank you so much.
Name:  Screenshot 2020-07-21 at 3.42.56 PM.png
Views: 14
Size:  38.5 KB
Why is the answer D not B? What is the difference between them? We should only be able to determine the distance to star but not galaxy as galaxy do not emit light.
Name:  Screenshot 2020-07-21 at 3.43.06 PM.png
Views: 12
Size:  72.1 KB
Is it because both nitrogen and hydrogen should have same temperature and thus average KE. By KE = p/2m, nitrogen having higher mass, should have larger momentum.
Name:  Screenshot 2020-07-21 at 3.43.14 PM.png
Views: 10
Size:  63.5 KB
Since it is young star, the answer is definitely not red giant and white dwarf. What is the difference between A and B?

Thank you so much!!
Last edited by ialfighter2020; 1 year ago
0
reply
Joinedup
Badges: 20
Rep:
?
#2
Report 1 year ago
#2
High mass main sequence stars don't last for a long time but low mass main sequence stars do... so I'd expect more of the high mass main sequence stars in a group of young stars.

First question seems wonky,
Type 1A supernovae are a type of standard candle that is used to calculate the distance to distant (high z) galaxies.
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Poll: What factors affect your mental health most right now? Post-lockdown edition

Anxiousness about restrictions easing (30)
5.32%
Uncertainty around my education (65)
11.52%
Uncertainty around my future career prospects (66)
11.7%
Lack of purpose or motivation (75)
13.3%
Lack of support system (eg. teachers, counsellors, delays in care) (32)
5.67%
Impact lockdown had on physical health (28)
4.96%
Social worries (incl. loneliness/making friends) (60)
10.64%
Financial worries (35)
6.21%
Concern about myself or my loves ones getting/having been ill (22)
3.9%
Exposure to negative news/social media (34)
6.03%
Difficulty accessing real life entertainment (15)
2.66%
Lack of confidence in making big life decisions (56)
9.93%
Worry about missed opportunities during the pandemic (46)
8.16%

Watched Threads

View All