Sometimes when a vehicle is driven at a particular speed, a rattling sound is heard. Explain briefly, why this happens and give the name of the phenomenon taking place.

Hint: Resonance happens once a material oscillates at a high amplitude at a particular frequency. We tend to call this frequency resonant frequency. A development during which an external force or a vibratory system forces another system around it to vibrate with a bigger amplitude at a nominal frequency of operation.

Complete answer:
Every natural frequency of the thing is related to one of various standing wave patterns by that object may vibrate. The natural frequencies of an instrument square measure generally observed because of the harmonics of the instrument.
An instrument is forced into moving at one amongst its harmonics (with one amongst its undulation patterns) if another interconnected object pushes it with one amongst those frequencies. This can be called resonance — once one object moving at an equivalent natural frequency of a second object forces that second object into vibrational motion.
It happens because of the resonance. Once a vehicle is driven, the piston of the engine makes in and out motion at a frequency relying upon its speed. The vibrations caused by the movement of the piston are transmitted to any or all components of the vehicle. It's simply attainable that some components of the vehicle (or its frame), might have a natural frequency of to and fro movement of the piston at the sure speed of the vehicle. Once this happens, then at this explicit speed of the vehicle that half starts vibrating smartly because of the resonance. So now we can say why this rattling sound occurred. Whenever this type of condition happens then we will have to suffer from this.
Now the next part is how it can be stopped.
So for solving this problem we have to change the speed of the vehicle so that the condition of the resonance will not occur.

Note:
Resonance happens once a system is ready to store, and simply transfers energy between two or a lot of totally different storage modes (such as mechanical energy and potential energy within the case of an easy pendulum). However, there are some unit losses from cycle to cycle, referred to as damping. Once damping is little, the resonant frequency is around adequate the natural frequency of the system that could be a frequency of unforced vibrations. Some systems have multiple, distinct, resonant frequencies.