Sunday, February 23, 2014
Thursday, January 23, 2014
This theory is part of the CXC CSEC Physics and is used to illustrate the scientific method. This article gives a useful view of the topic and the nature of scientific theories. Here is a short extract:
"...in the late 1700s there was a theory of heat known as caloric. The basic idea of caloric was that it was a fluid that existed within materials. This fluid was self-repellant, meaning it would try to spread out as evenly as possible. We couldn't observe this fluid directly, but the more caloric a material has the greater its temperature.
The basic assumption of a 'heat fluid' doesn't match reality, but the model makes predictions that are correct. In fact the caloric model works as well today as it did in the late 1700s. We don't use it anymore because we have newer models that work better. Kinetic theory makes all the predictions caloric does and more. Kinetic theory even explains how the thermal energy of a material can be approximated as a fluid."
Saturday, December 28, 2013
“As the planet crosses its star, its atmosphere absorbs certain wavelengths of light or colors, while allowing other wavelengths of light to pass through”
Thursday, November 28, 2013
Monday, October 28, 2013
Monday, September 30, 2013
In this post we briefly review two apps used to generate sound.
The writer found the app 'PA tone' to be good for producing a constant tone of a specific frequency (0-20kHz) assuming your speaker can handle it. Frequency selection was easy and fine control possible. There was also a choice of waveforms.
Also useful for certain situations is the app 'FG' which gives a tone starting at one specific frequency (0-20kHz) and ending at another selected frequency.