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Why do lasers produce an intense coherent beam of light?

Lasers produce an intense coherent beam of light because the waves have the same frequency, are in phase with each other and have a low divergence.
LB
Answered by Lily B. • Physics tutor
5952 Views

What is the difference between a metaphor and a simile?

A simile is a figure of speech that refers to comparable phrases that are alike in some way (e.g. 'as black as coal'). Contrastingly, a metaphor is a figure of speech that is applied without being the litera...
DO
9447 Views

What is the perpendicular bisector of the point (0,2) and (1,0)?

First things first it will definately be useful to make a quick sketch of the x-y axes, the two points, and roughtly what the perpendicular bisector will look like. This kind of question can be made much mor...
JR
Answered by Josh R. • Maths tutor
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Why maths?

Maths has always been a passion of mine from a young age. I've always enjoyed helping others with their maths as I find it extremely stimulating.
LC
Answered by Lauren C. • Maths tutor
5121 Views

A note was played on a a keyboard. The frequency of the note was 440 Hz. (a) What does a frequency of 440 Hz mean? (b) The sound waves produced by the keyboard travel at a speed of 340 m/s. Calculate the wavelength of the note.

(a) A frequency of 440 Hz means that a single trough and peak of the sound wave oscillates 440 times per second or equally that 440 sound waves are produced by the keyboard per second (This is because the SI...
IW
Answered by Ifan W. • Physics tutor
41173 Views