Answer:
A model is defined as a structure used to represent an object, usually of a different scale.
Explanation:
In quantum mechanics and particle physics, many of the particles are subatomic, meaning that they are smaller than atoms. This is where a model would be useful. A model could help people to visualise what the particle looks like, and in general would make it easier to understand the behaviour of such a particle.
The initial velocity (its speed before falling off) is approximately 1.95 m/s
The pitch of a sound is most closely related to the frequency of vibrations.
The answer is B- Perfect Cosmological Principle
Sorry it took people so long to anser:)
