Refer to Interactive Solution 27.9 for help in solving this problem. In a Young's double-slit experiment the separation distance y between the second-order bright fringe and the central bright fringe on a flat screen is 0.0151 m, when the light has a wavelength of 425 nm. Assume that the angles are small enough so that sin is approximately equal to tan . Find the separation y when the light has a wavelength of 560 nm.

  y = 0.0199 m

Explanation:

The double slit experiment is described by the expression

          d sin θ = m λ

Where d is the separation of the slits, λ the wavelength and m an integer that gives the order of interference.

In this experiment the pattern is registered on a screen.

         tan θ = y / x

As the angles are very small

          tan θ = sin θ / cos θ = sin θ

We replace

         d y / x = m λ

Let's look with the initial data for the distance between the slits

          d / x = m λ / y

           m = 2

           d / x = 2 425 10⁻⁹ / 0.0151

           .d / x = 5.629 10⁻⁵ m

Now let's look for the spread if we change the wavelength

          λ = 560 nm = 560 10⁻⁹ m

          y = m λ   1 (d / x)

Let's calculate

          y = 2 560 10⁻⁹   1/ 5.629 10⁻⁵

          y = 1.9897 10⁻² m

          y = 0.0199 m

relativism, roughly put, is the view that truth and falsity, right and wrong, standards of reasoning, and procedures of justification are products of differing conventions and frameworks of assessment and that their authority is confined to the context giving rise to them. more precisely, “relativism” covers views which maintain that—at a high level of abstraction—at least some class of things have the properties they have (e.g., beautiful, morally good, epistemically justified) not simpliciter, but only relative to a given framework of assessment (e.g., local cultural norms, individual standards), and correspondingly, that the truth of claims attributing these properties holds only once the relevant framework of assessment is specified or supplied. relativists characteristically insist, furthermore, that if something is only relatively so, then there can be no framework-independent vantage point from which the matter of whether the thing in question is so can be established.

relativism has been, in its various guises, both one of the most popular and most reviled philosophical doctrines of our time. defenders see it as a harbinger of tolerance and the only ethical and epistemic stance worthy of the open-minded and tolerant. detractors dismiss it for its alleged incoherence and uncritical intellectual permissiveness. debates about relativism permeate the whole spectrum of philosophical sub-disciplines. from ethics to epistemology, science to religion, political theory to ontology, theories of meaning and even logic, philosophy has felt the need to respond to this heady and seemingly subversive idea. discussions of relativism often also invoke considerations relevant to the very nature and methodology of philosophy and to the division between the so-called “analytic and continental” camps in philosophy. and yet, despite a long history of debate going back to plato and an increasingly large body of writing, it is still difficult to come to an agreed definition of what, at its core, relativism is, and what philosophical import it has. this entry attempts to provide a broad account of the many ways in which “relativism” has been defined, explained, defended and criticized.

explanation:

technology is the application of the knowledge gained by science.