Mathematics - Additional - 0606 CIE

Linear Law (straight-line Form)

Akopọ

Experimental data rarely falls on a straight line, but a clever change of variables can often make it do so. By taking logarithms, a power law or an exponential law can be straightened into the form \(Y=mX+c\). Then the gradient and intercept of the straight-line graph hand you the unknown constants.

In this lesson you will convert relationships such as \(y=Ax^n\) and \(y=Ab^x\) into straight-line form by taking logarithms, identify what to plot, and read off the constants from the gradient and intercept. This is the bridge between curved real-world data and the simple line you know how to analyse.

Awọn Afojusun

  1. Transform given relationships, such as y = Ax to the power n and y = Ab to the power x, to and from straight-line form.
  2. Determine unknown constants by calculating the gradient or intercept of the transformed straight-line graph.

Akọ̀wé Ẹ̀kọ́

Scientists and engineers test whether data obeys a power or exponential law by plotting logarithms and checking for a straight line. The technique is a staple of practical work and of the higher-level syllabus, because it turns the hard problem of fitting a curve into the easy one of fitting a line.

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Ìdánwò Ẹ̀kọ́

Oriire fun ipari ẹkọ lori Linear Law (straight-line Form). Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.

Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.

Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.

  1. To straighten y = Ax^n, you plot: A. y against x B. lg y against lg x C. lg y against x D. y against lg x Answer: B
  2. To straighten y = Ab^x, you plot: A. lg y against lg x B. lg y against x C. y against x D. y against lg x Answer: B
  3. Taking logs of y = Ax^n gives: A. lg y = n lg x + lg A B. lg y = A lg x + n C. lg y = lg x + n lg A D. y = n lg x + A Answer: A
  4. If lg y against lg x has gradient 3 and intercept 0.7 for y = Ax^n, then n is: A. 0.7 B. 3 C. 10^0.7 D. 0.3 Answer: B
  5. If the intercept of the straight-line graph is lg A = 1, then A equals: A. 1 B. 10 C. 0.1 D. 100 Answer: B

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Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.

Awọn akọsilẹ ẹkọ ni kikun pẹlu awọn aworan apejuwe
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O wa lori ohun elo Green Bridge

Gba ohun elo Green Bridge CBT sori foonu tabi kọmputa rẹ lati ri awọn akọsilẹ ẹkọ ni kikun, awọn ibeere adaṣe, ati diẹ sii.

Awọn akọsilẹ ẹkọ ni kikun pẹlu awọn aworan apejuwe
Oluranlọwọ ẹkọ ti AI ṣe agbara rẹ
Kọ ẹkọ laisi intanẹẹti, nigbakugba, nibikibi
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