WPH0 QR Dynamic Papers Physics al Edexcel

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Edexcel | Physics WPH0 | S 10 5 1 | 1 hour 30 minutes

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15

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The Sun behaves as an approximate black-body radiator with peak energy radiation

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(a) (I)

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2 Mark s

Show that the Sun has a surface temperature of about 6000 K.

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(a) (II)

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2 Mark s

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(a) (III)

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2 Mark s

Hence calculate the radius of the Sun.

Radius = ...............................................................

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(b)

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3 Mark s

The huge power output of the Sun is due to nuclear fusion reactions taking place

within its core. State and explain the conditions necessary for fusion to occur.

The answer must be clear, use an appropriate style and be organised in a

logical sequence

High temperature AND high density/pressure

Any two reasons from:

Overcome coulomb/electrostatic repulsion

Nuclei come close enough to fuse/for strong (nuclear) force to act

High collision rate/collision rate is sufficient

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