A micro-electromechanical system (MEMS) silicon cantilever sensor inside a smartphone is analyzed under different operational conditions.
Which of the following describes a scenario where the cantilever undergoes a forced oscillation?
The cantilever is deflected by a single electrostatic pulse and subsequently vibrates at its natural frequency of 150 kHz150\text{ kHz}150 kHz with decaying amplitude.
The cantilever vibrates continuously at 120 kHz120\text{ kHz}120 kHz due to the pressure oscillations of an incoming acoustic wave of frequency 120 kHz120\text{ kHz}120 kHz.
The cantilever remains statically deflected under a constant gravitational force when the smartphone is held at a steady angle of 45∘45^\circ45∘.
The cantilever is released from an initially bent position and undergoes damped simple harmonic motion to return to its equilibrium position.
39 exam-style questions on OCR A A Level Physics Oscillations, covering Simple harmonic oscillations, Energy of a simple harmonic oscillator, and Damping. Each one has a worked solution and a mark scheme showing where the marks go.