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.
Wednesday, August 14, 2013
Android phones (smartphones) and tablets can both detect sound (mike) and produce sound and can thus make useful tools for sound experiements. So far the writer has seen apps for measuring sound loudness (in dB), analysing sound frequency and generating sounds of a specific frequency. Specific apps are used as examples. There are often many similar apps and I cannot guarantee that I found the best.
Measuring sound loudness - the app Sound Meter (Lite) shows the loudness on a meter-type display along with max and min values. Also displayed is a real time graph. The maximum sound loudness is 82dB on my tablet - this is a limitation and varies with hardware brand and model. I noticed that the sound of heavy rain on a metal roof maxed out the meter at 82dB.
More in another post.
Sunday, June 30, 2013
Not really new physics in this news item but new technology which provides a new tool for science.
'Physicists at The University of Texas at Austin have built a tabletop particle accelerator that can generate energies and speeds previously reached only by major facilities that are hundreds of meters long and cost hundreds of millions of dollars to build.'Lots of good physics in this to discuss. Our university should have one of these in 5-10 years...
Wednesday, May 29, 2013
discussion of this in the "Quantum Progress" blog - a blog which seems to be really useful for Physics teachers in general. The accelerometer is not what one might initially expect...
"The first thing students noticed that was strange is that even when the phone was sitting completely still, which should be an acceleration of zero, the phone would read an acceleration in the vicinity of 10 m/s2. "See the article for the explanation.