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Edexcel | Physics WPH0 | S 10 6 1 | 1 hour 15 minutes

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In 2006 astronomers determined a new value for the Hubble constant. They calculated

the velocity of recession v for a number of stars at a distance d from the Earth. They

used units of km s–1 for v and Mpc (Megaparsecs) for d.

3

(a)

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What might an astronomer actually measure to calculate a value for v?

Red shift

OR Doppler shift

OR frequency of electromagnetic radiation/light

OR wavelength of electromagnetic radiation/light

3

(b)

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The graph below is a plot of their data.

3

(b) (I)

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Draw a line of best fit for this data

Line of best fit

3

(b) (II)

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2 Mark s

Determine the gradient of your line.

Gradient =

large triangle used

gradient in range 62.0 - 66.0 with 2/3SF

Example of calculation

(16000 – 0)/(250 – 0) = 64 (ignore unit)

3

(c) (I)

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Hubble’s law states that v is directly proportional to d. Explain whether the

plotted data supports Hubble’s law.

Yes, as best fit line is straight and passes through origin

OR No, as best fit line does not pass through origin

3

(c) (II)

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The value of the gradient is the Hubble constant.

Calculate the percentage difference between this accepted value and your value.

Percentage difference =

Percentage difference calculated using 71 as denominator

Example of calculation

(71 – 64)/71 = 10%

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