IAL Physics Unit 5 June 2018

Unless it's told or implied, 3 s.f. will be sufficient. If the question has asked to or implied to leave a particular answer in a specifc s.f. and if you don't do so, you will lose marks.

what exactly do you mean by implied?

Reply 41

Profane

8

Original post by kunalkishanmehta

what exactly do you mean by implied?

This is more of a thing for unit 6. Say if you had a table of data with all the data at 3 decimal points. If you had to do some calculation and obtain a value, it's best if you leave the answer to 3 decimal points too. This is a standard practice in physics, to keep the degree of significance of data proper.

Leaving your answer to 3 sf when the degree of significance is implied doesn't really make you lose marks in Unit 4 and 5. It's strict in unit 6.

(edited 5 years ago)

Reply 42

kunalkishanmehta

9

Original post by Profane

This is more of a thing for unit 6. Say if you had a table of data with all the data at 3 decimal points. If you had to do some calculation and obtain a value, it's best if you leave the answer to 3 decimal points too. This is a standard practice in physics, to keep the degree of significance of data proper.

Leaving your answer to 3 sf when the degree of significance is implied doesn't really make you lose marks in Unit 4 and 5. It's strict in unit 6.

Oh alright makes sense. Thanks.

Reply 43

kunalkishanmehta

9

Original post by Profane

This is more of a thing for unit 6. Say if you had a table of data with all the data at 3 decimal points. If you had to do some calculation and obtain a value, it's best if you leave the answer to 3 decimal points too. This is a standard practice in physics, to keep the degree of significance of data proper.

Leaving your answer to 3 sf when the degree of significance is implied doesn't really make you lose marks in Unit 4 and 5. It's strict in unit 6.

Do you feel prepared for the exam? How well have you been scoring in your mocks if you don't mind me asking?

(edited 5 years ago)

Reply 44

Black.Panther00

10

Okay so guys , how do the fission reaction leads to large output of energy

Reply 45

MclarenP1

9

Original post by Black.Panther00

Okay so guys , how do the fission reaction leads to large output of energy

In fission large unstable nuclei split into smaller stable daughter nuclei .
This means that the overall binding energy per nucleon has increased (as the daughter nuclei are more stable so require more energy to be broken down) .This means that there is a mass deficit and there energy is released in the process as E=mc^2

Thats about it really

Reply 46

pearl02

4

Can anyone explain why the answer is C? :s-smilie:

Screenshot (73).png155.4KB

Reply 47

unknown2914

9

Original post by Black.Panther00

Okay so guys , how do the fission reaction leads to large output of energy

There is an mass defect. This mass is converted to energy using the relationship E=mc^2 where m is the mass defect

Reply 48

kunalkishanmehta

9

Original post by pearl02

Can anyone explain why the answer is C? :s-smilie:

mean square speed is proportional to temperature
1/2 m <c^2>= 3/2 kT

Reply 49

unknown2914

9

How does an increase in temperature lead to an increase in relative intensity

Reply 50

MclarenP1

9

Original post by unknown2914

How does an increase in temperature lead to an increase in relative intensity

temperature causes energy to increase and as energy increases power (which is the rate of energy increases) and power = Intensity/area hence intensity increases.

Reply 51

Black.Panther00

10

Original post by MclarenP1

In fission large unstable nuclei split into smaller stable daughter nuclei .
This means that the overall binding energy per nucleon has increased (as the daughter nuclei are more stable so require more energy to be broken down) .This means that there is a mass deficit and there energy is released in the process as E=mc^2

Thats about it really

Original post by unknown2914

There is an mass defect. This mass is converted to energy using the relationship E=mc^2 where m is the mass defect

which is correct??

Reply 52

kunalkishanmehta

9

what is the difference between random and spontaneous decay?

Reply 53

MclarenP1

9

Original post by Black.Panther00

which is correct??

The answers are the same my friend I've just explained the process as well.

Reply 54

pearl02

4

Original post by kunalkishanmehta

mean square speed is proportional to temperature
1/2 m <c^2>= 3/2 kT

I feel like such an idiot... I was squaring the mean square speed... :colonhash:

Thank you so much :smile:

Reply 55

unknown2914

9

Original post by MclarenP1

temperature causes energy to increase and as energy increases power (which is the rate of energy increases) and power = Intensity/area hence intensity increases.