Top answers

Physics
A Level

You have a layer of glass with a refractive index of 1.5 and the glass is surrounded by air. A light ray shines into the glass and Total Internal Reflection occurs at the glass-air boundary. What is the critical angle?

This question tests your knowledge of Snell's law, Total Internal Reflection (TIR) and the fact that the refractive index of air is 1 (which should be memorised as it is in the exam). The critical angle i...

KC
Answered by Kelvin C. Physics tutor
3432 Views

What is the critical angle of a beam of light leaving a transparent material with a refractive index of 2?

Total internal reflection occurs only when light travels from a medium of high refractive index to a medium of low refractive index. This is the case for our problem (glass to air boundary, n=2 and n=1 re...

AH
Answered by Arsenios H. Physics tutor
4259 Views

An ultraviolet wave of continuous frequency reflects from a solid surface back in the direction of the transmitter. Assuming no amplitude is lost, describe and explain the behaviour of the particles in the medium between the transmitter and surface.

The transmitted and reflected waves are of equal frequency and are both continuous, so they will superpose and interfere with each other. In the regions of maximal constructive interference, antinodes wil...

JS
Answered by Jonas S. Physics tutor
2149 Views

What path would a charge moving in the x-y plane track, in the presence of a uniform magnetic field out of the page?

The magnetic force on a moving charge is always perpendicular to the directions of both velocity and B-field vectors. This means that in the presence of a uniform magnetic field, a particle will experienc...

AH
Answered by Arsenios H. Physics tutor
1954 Views

If an alpha particle (Z = 2) of kinetic energy 7 MeV is incident on a gold nucleus (Z = 79), what is its closest distance of approach?

In Rutherford Scattering, an incident particle will reach the closest distance of approach when it is on a collision course head on with the target nucleus. At the closest distance of approach, the alpha ...

RN
Answered by Robert N. Physics tutor
4328 Views

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