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Chapter 25: Q1CQ (page 927)

Models are particularly useful in relativity and quantum mechanics, where conditions are outside those normally encountered by humans. What is a model?

Short Answer

Expert verified

Models are mathematical and Physical representations of concepts, ideas, or theories for better understanding. Before converting it into a device, models are designed.

Step by step solution

01

Definition

A model is a display of something that is very hard or impossible to represent directly.

Its accuracy lies in limited conditions.

It should verify experimental data.

02

Example

For Example: In Atom, electron orbits around the nucleus, but one can’t see it directly with naked eyes because it is very small. But one can draw a structure of an atom for explanations.

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Most popular questions from this chapter

(a) What is the focal length of a magnifying glass that produces a magnification of \(3.00\) when held \(5.00{\rm{ }}cm\) from an object, such as a rare coin? (b) Calculate the power of the magnifier in diopters. (c) Discuss how this power compares to those for store-bought reading glasses (typically \(1.0\) to \(4.0\)). Is the magnifier’s power greater, and should it be?

Suppose light were incident from air onto a material that had a negative index of refraction, say –1.3; where does the refracted light ray go?

In Example \(25.7\), the magnification of a book held \(7.50cm\) from a \(10.0cm\) focal length lens was found to be \(3.00\). (a) Find the magnification for the book when it is held \(8.50cm\) from the magnifier. (b) Do the same for when it is held \(9.50cm\) from the magnifier. (c) Comment on the trend in m as the object distance increases as in these two calculations.

How far from a piece of paper must you hold your father’s 2.25 Dreading glasses to try to burn a hole in the paper with sunlight?

A ray of light, emitted beneath the surface of an unknown liquid with air above it, undergoes total internal reflection as shown in Figure 25.55. What is the index of refraction for the liquid and its likely identification?

Figure 25.5 A light ray inside a liquid strikes the surface at the critical angle and undergoes total internal reflection.
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