OCR Physics A G485 - Frontiers of Physics - 18th June 2015 Watch

[email protected]
Badges: 9
#1181
Report 3 years ago
#1181
what is definition for 1 parsec?
reply
kate8
Badges: 2
Rep:
?
#1182
Report 3 years ago
#1182
(Original post by [email protected])
what is question?
If capacitors of different capacitance were in parallel would they still discharge at the same rate. Or because the current through them is different the one with the greater capacitance discharges faster?
0
reply
jcwh97
Badges: 2
Rep:
?
#1183
Report 3 years ago
#1183
(Original post by buxtonarmy)
Thanks bro so how would I do 4bi on this paper? It's similar and I still struggle

http://www.ocr.org.uk/Images/65365-q...of-physics.pdf
0.15 x speed of light

Use the change in wavelength formula
0
reply
kate8
Badges: 2
Rep:
?
#1184
Report 3 years ago
#1184
(Original post by [email protected])
what is definition for 1 parsec?
distance that gives a parallax angle of 1arcsecons
0
reply
jcwh97
Badges: 2
Rep:
?
#1185
Report 3 years ago
#1185
(Original post by [email protected])
what is definition for 1 parsec?
The distance from the baseline of 1AU that subtends an angle of 1 arc second.
0
reply
Chung224
Badges: 13
Rep:
?
#1186
Report 3 years ago
#1186
(Original post by kate8)
If capacitors of different capacitance were in parallel would they still discharge at the same rate. Or because the current through them is different the one with the greater capacitance discharges faster?
Where RxC the resistance will decrease if put in parallel.... hence the time constant increases this means that the rate of change of V,Q or I must decrease as a larger time to fall to 1/e of its initial value hence the initial rate of discharge will decrease

Oops sorry thought you said resistance, capacitors work the same way, if put in parallel, total capacitance increases to larger time constant same explanation
0
reply
jcwh97
Badges: 2
Rep:
?
#1187
Report 3 years ago
#1187
(Original post by jamesbird18)
Can somebody please help me? If we get a question that involves,say a proton moving from left to right would you say the current is moving left to right or not? Could alter any answer using FLHR thats all
The current flows in the same direction as the protons and opposite to electrons.
0
reply
ForgottenApple
Badges: 14
Rep:
?
#1188
Report 3 years ago
#1188
(Original post by Chung224)
Where RxC the resistance will decrease if put in parallel.... hence the time constant increases this means that the rate of change of V,Q or I must decrease as a larger time to fall to 1/e of its initial value hence the initial rate of discharge will decrease
that makes no sense to me
0
reply
Chung224
Badges: 13
Rep:
?
#1189
Report 3 years ago
#1189
(Original post by ForgottenApple)
that makes no sense to me
Which part bro?
0
reply
[email protected]
Badges: 9
#1190
Report 3 years ago
#1190
Can someone explain how I got from
s-1 Hubbles constant to
kms-1 Mpc-1
reply
fnatic NateDestiel
Badges: 16
Rep:
?
#1191
Report 3 years ago
#1191
(Original post by [email protected])
what is definition for 1 parsec?
The distance that gives a stellar parallax 1 second of arc.
0
reply
nothepreacher
Badges: 17
Rep:
?
#1192
Report 3 years ago
#1192
(Original post by ETRC)
-intensifier absorbs x-rays by photographic film
-scintillator is used as an intensifier
-scintillator converts x-ray photon into many photons of visible light
-photons of visible light releases electrons so a lower exposure time to x-rays is needed
-gives a sharper images
Hey do you know which has greater energy - a pair production x ray or a compton effect x ray?
0
reply
Smug Life
Badges: 12
Rep:
?
#1193
Report 3 years ago
#1193
(Original post by [email protected])
Can someone explain how I got from
s-1 Hubbles constant to
kms-1 Mpc-1
Still on 2010?
0
reply
randlemcmurphy
Badges: 10
Rep:
?
#1194
Report 3 years ago
#1194
(Original post by Chung224)
Where RxC the resistance will decrease if put in parallel.... hence the time constant increases this means that the rate of change of V,Q or I must decrease as a larger time to fall to 1/e of its initial value hence the initial rate of discharge will decrease

Oops sorry thought you said resistance, capacitors work the same way, if put in parallel, total capacitance increases to larger time constant same explanation
If the resistance decreases shouldn't the time constant...?
0
reply
JayGreen
Badges: 1
Rep:
?
#1195
Report 3 years ago
#1195
(Original post by nothepreacher)
Hey do you know which has greater energy - a pair production x ray or a compton effect x ray?
pair production x-ray has the highest frequency, E= hf so id say the pair production x-ray
0
reply
[email protected]
Badges: 9
#1196
Report 3 years ago
#1196
(Original post by Smug Life)
Still on 2010?
What do you mean?
reply
actanide
Badges: 2
Rep:
?
#1197
Report 3 years ago
#1197
(Original post by randlemcmurphy)
If the resistance decreases shouldn't the time constant...?
yeah thats what i was thinking: t is proportional to C and R so if C decreases so much t
0
reply
stargazer678
Badges: 0
Rep:
?
#1198
Report 3 years ago
#1198
could someone show me what a good drawing is for the definition of a parsec? (has the sun, earth, star, AU in!)
0
reply
ETRC
Badges: 17
Rep:
?
#1199
Report 3 years ago
#1199
(Original post by nothepreacher)
Hey do you know which has greater energy - a pair production x ray or a compton effect x ray?
pair production is highest- they involve high energy x-rays being released

then its compton

photoelectrons from photoelectric have least energy


my brain hurts now from revising for 7 hours with a 30min break -.-
0
reply
[email protected]
Badges: 9
#1200
Report 3 years ago
#1200
(Original post by stargazer678)
could someone show me what a good drawing is for the definition of a parsec? (has the sun, earth, star, AU in!)
June 2013 Q10
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
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

University open days

  • Cranfield University
    Cranfield Forensic MSc Programme Open Day Postgraduate
    Thu, 25 Apr '19
  • University of the Arts London
    Open day: MA Footwear and MA Fashion Artefact Postgraduate
    Thu, 25 Apr '19
  • Cardiff Metropolitan University
    Undergraduate Open Day - Llandaff Campus Undergraduate
    Sat, 27 Apr '19

Have you registered to vote?

Yes! (213)
39.3%
No - but I will (38)
7.01%
No - I don't want to (36)
6.64%
No - I can't vote (<18, not in UK, etc) (255)
47.05%

Watched Threads

View All