Competition - post a photo you've taken of nature >>

Mc q help!

Lamalam

Why am I wrong in these questions?

Posted from TSR Mobile

Reply 1

krisshP

Original post by Lamalam

Why am I wrong in these questions?

Posted from TSR Mobile

Q3-Not sure

Q7-
http://www.thestudentroom.co.uk/showthread.php?t=2714226&p=48181299

Krishna

Reply 2

interstitial

3. Gravity is the weakest fundamental force.

7. It's artificial, not natural background radiation. Bit of a strange question though TBH.

(edited 9 years ago)

Reply 3

Lamalam

Original post by krisshP

Q3-Not sure

Q7-
http://www.thestudentroom.co.uk/showthread.php?t=2714226&p=48181299

Krishna

So only NAtural background radiation is counted ! Thanks!

May I ask one more question?

When using standard candle , the distance calculated is actually the distance of the standard candle . But how can I use this distance to estimate distance of other stars?

Thank you

Posted from TSR Mobile

(edited 9 years ago)

Reply 4

krisshP

Original post by Arithmeticae

3. Gravity is the weakest fundamental force.

Then why are protons locked in nucleus then? Wouldn't they all come out due to repulsion? Or is it due to the strong nuclear force thingy?

Thanks

Reply 5

interstitial

Original post by krisshP

Then why are protons locked in nucleus then? Wouldn't they all come out due to repulsion? Or is it due to the strong nuclear force thingy?

Thanks

Yeah, exactly. At a certain distance, the repulsive force is overcome by the strong nuclear force (that's why it's the STRONG force, it's much stronger than the other forces :tongue:

) but it only takes effect at extremely short distances.

(edited 9 years ago)

Reply 6

amongsttheweeds

Original post by Lamalam

Why am I wrong in these questions?

Posted from TSR Mobile

Microwave ovens are sources of background radiation, even if it is artificial. The wording of the question is very poor.

Reply 7

interstitial

Checking on Wikipedia, it seems to also say that artificial items (in particular, consumer items) can still be sources of background radiation T_T.

Reply 8

amongsttheweeds

Original post by Arithmeticae

Checking on Wikipedia, it seems to also say that artificial items (in particular, consumer items) can still be sources of background radiation T_T.

Yeah, I suppose there are different definitions of what constitutes background radiation. You can see what the question is getting at with the possible answers, but it's somewhat ambiguous. :frown:

Reply 9

krisshP

Original post by Arithmeticae

Yeah, exactly. At a certain distance, the repulsive force is overcome by the strong nuclear force (that's why it's the STRONG force, it's much stronger than the other forces :tongue:

) but it only takes effect at extremely short distances.

Ok, makes sense.

Thanks
Krishna

Reply 10

krisshP

Original post by Lamalam

When using standard candle , the distance calculated is actually the distance of the standard candle . But how can I use this distance to estimate distance of other stars?

We get the distance to NEIGHBOUR stars which are close to the standard candle.

Reply 11

Jaydude

Original post by krisshP

We get the distance to NEIGHBOUR stars which are close to the standard candle.

Don't astronomers compare flux reached here on earth from the observed star, compare it to standard candle to determine luminosity of the observed star. Then apply inverse square law to get D???

Posted from TSR Mobile