The diagram shows an arrangement to stop trains that are travelling too fast. Trains coming from the left travel at a speed of 50 m s-1.

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Air is trapped inside a glass bulb which is immersed in water and attached to a U-tube containing mercury.

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(a) Give one example of a hadron: a lepton: [1] (b) Describe, in terms of the simple quark model,

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(a) A nuclear reaction occurs when a uranium-235 nucleus absorbs a neutron. The reaction may be represented by the equation:

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(a) Define magnetic flux density. [3] (b) A stiff copper wire is balanced horizontally on a pivot, as shown in Fig. 8.1.

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The electric potentials V are measured at distances x from P along a line PQ. The results are

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Monochromatic light of wavelength λ is incident on two narrow slits S1 and S2, a small distance apart

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