(a) Explain what is meant by the natural frequency of vibration of a system. (b) A block of metal is fixed to one end of a vertical spring. The other end of the spring is attached to an oscillator, as shown in [Figure 4.1]. The amplitude of oscillation of the oscillator is constant. The variation of the amplitude x₀ of the oscillations of the block with frequency f of the oscillations is shown in [Figure 4.2]. (i) Name the effect shown in [Figure 4.2]. (ii) State and explain whether the block is undergoing damped oscillations. (c) State one example in which the effect shown in [Figure 4.2] is useful.

1. (a)Explain what is meant by the natural frequency of vibration of a system.[1]
2. (b)(i)Name the effect shown in Fig. 4.2.[1]
3. (b)(ii)State and explain whether the block is undergoing damped oscillations.[2]
4. (c)State one example in which the effect shown in Fig. 4.2 is useful.[1]

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