AQA Physics Unit 1 PHYA1 20th May 2013

I've come over the isotope definition a million times and I always get the two marks in the mark scheme for saying that "same proton number, different amount of neutrons" but I never know how to word it, I find it weird to write "something with the same proton number....". I hate writing "something" in exams as I've been told by many examiners not to do it. Does anyone know how you could word the definition of an isotope better?

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I find this too. I say 'atoms of the same element..'

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Reply 801

x-Sophie-x

13

I think you could also say nuclide.

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Reply 802

lookbehindyouNOW

atoms of the same element with the same number of protons, but different number of neutrons.

salters chemistry definitions :smile:

Reply 803

Ephixa

Any one got any good websites for electricity revision?

Reply 804

lookbehindyouNOW

PLEASE can someone explain the practical aspect of an oscilloscope

Reply 805

Ephixa

Original post by lookbehindyouNOW

PLEASE can someone explain the practical aspect of an oscilloscope

Oscilloscopes are used to show the waveform of the wave that you are measuring. The height of the trough/crest determines the magnitude of the wave. The horizontal length of the waveform shows the time bas
Hope that helps :smile:

I'm panicking.

Original post by lookbehindyouNOW

atoms of the same element with the same number of protons, but different number of neutrons.

salters chemistry definitions :smile:

Cheers

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Reply 808

Ephixa

Original post by simon105

I'm panicking.

It's ok just stay calm its an alright exam just don't panic

Reply 809

simon105

Original post by FrankB3

I've come over the isotope definition a million times and I always get the two marks in the mark scheme for saying that "same proton number, different amount of neutrons" but I never know how to word it, I find it weird to write "something with the same proton number....". I hate writing "something" in exams as I've been told by many examiners not to do it. Does anyone know how you could word the definition of an isotope better?

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My default expression is 'An isotope of an element is made up from...'

Reply 810

Tuya

4

Original post by simon105

My default expression is 'An isotope of an element is made up from...'

I try to be bulletproof with this definition, so I say:
Isotopes are atoms of the same element with equal number of protons, but different number of neutrons, and hence different mass number.

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Reply 811

Monster94

Does anyone have a link to the Nelson thornes textbook answers?

Reply 812

username1099191

5

"Practical questions" involving circuits: would you say that the potential divider is used to vary the current or the pd? (i.e. is the current the independent or dependent variable here)

Reply 813

Surf

15

Original post by Monster94

Does anyone have a link to the Nelson thornes textbook answers?

http://www.studentcreche.co.uk/showthread.php?t=764&page=1

Reply 814

NtainS

Original post by jazzynutter

"Practical questions" involving circuits: would you say that the potential divider is used to vary the current or the pd? (i.e. is the current the independent or dependent variable here)

Varies potential difference.

Reply 815

x-Sophie-x

13

In the marscheme for a ionisation and excitation question, it says the electron receives exactly the right amount of energy in both cases.

Help? I thought in ionisation, the extra energy is the kinetic energy of the electron..? So it doesn't have to be the exact amount of energy..

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Reply 816

Sukura

When you convert MeV into joules, how do you know what to multiply it by? One past paper says 1.6x10-13 and another said 1.6x10-19

The past paper is: jan 2011 question 3

Please help! I want full ums!

(edited 10 years ago)

Reply 817

username1099191

5

Original post by x-Sophie-x

In the marscheme for a ionisation and excitation question, it says the electron receives exactly the right amount of energy in both cases.

Help? I thought in ionisation, the extra energy is the kinetic energy of the electron..? So it doesn't have to be the exact amount of energy..

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It does take "extra" Ek from the electron, yes, but it always takes an exact amount of that "extra" Ek because of the discrete energy levels of the atom

Reply 818

x-Sophie-x

13

Original post by jazzynutter

It does take "extra" Ek from the electron, yes, but it always takes an exact amount of that "extra" Ek because of the discrete energy levels of the atom

So why does the incident photon/electron have to give the atomic electron an exact amount of energy?

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Reply 819

x-Sophie-x

13

Original post by Sukura

When you convert MeV into joules, how do you know what to multiply it by? One past paper says 1.6x10-13 and another said 1.6x10-19

The past paper is: jan 2011 question 3

Please help! I want full ums!

To convert MeV to J use ten to the minus thirteen.

And to convert eV to J use ten to the minus nineteen.

:smile:

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AQA Physics Unit 1 PHYA1 20th May 2013

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