Invisible neutrons can contribute to isotope mass

phet-steele commented 8 years ago

On the Make Isotopes screen, use one finger to grab a neutron from the bucket (don't release). With another finger, change the element. The original finger can now place an invisible neutron in the nucleus:

20160127_104328

Continuing from here, manipulating the neutrons (adding or subtracting them) can lead to numerous issues like

Nucleus shaking when the atom is shown as stable
Neutrons shaking while in the bucket
Multiple neutrons flying into the nucleus when only one was dragged in
Neutrons floating in random places on the screen without returning to the bucket or nucleus
Not being able to return all neutrons to the bucket

Tested on 1.0.0-dev.5 with iPad 2 iOS 9.2 & 9.3 beta (Witten & Tycho). For phetsims/tasks/issues/488.

phet-steele commented 8 years ago

Troubleshooting information (do not edit): Name: ‪Isotopes And Atomic Mass‬ URL: http://www.colorado.edu/physics/phet/dev/html/isotopes-and-atomic-mass/1.0.0-dev.5/isotopes-and-atomic-mass_en.html Version: 1.0.0-dev.5 2016-01-26 23:09:01 UTC Features missing: fullscreen User Agent: Mozilla/5.0 (iPad; CPU OS 9_2 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13C75 Safari/601.1 Language: en-us Window: 1024x671 Pixel Ratio: 1/1 WebGL: WebGL 1.0 (OpenGL ES 2.0 IMGSGX543-124.1) GLSL: WebGL GLSL ES 1.0 (OpenGL ES GLSL ES 1.00) Vendor: WebKit (WebKit WebGL) Vertex: attribs: 16 varying: 8 uniform: 128 Texture: size: 4096 imageUnits: 8 (vertex: 8, combined: 8) Max viewport: 4096x4096 OES_texture_float: true Dependencies JSON: {"assert":{"sha":"d4909677","branch":"master"},"axon":{"sha":"5a39ec57","branch":"master"},"babel":{"sha":"db982666","branch":"master"},"brand":{"sha":"8c6f9c04","branch":"master"},"chipper":{"sha":"57c99807","branch":"master"},"dot":{"sha":"ddf82014","branch":"master"},"isotopes-and-atomic-mass":{"sha":"3d0c3bb9","branch":"master"},"joist":{"sha":"4c228a32","branch":"master"},"kite":{"sha":"4a947119","branch":"master"},"phet-core":{"sha":"874a703d","branch":"master"},"phetcommon":{"sha":"3db92af3","branch":"master"},"scenery":{"sha":"953fe860","branch":"master"},"scenery-phet":{"sha":"e903fad2","branch":"master"},"sherpa":{"sha":"bf82eb95","branch":"master"},"shred":{"sha":"c1d4863f","branch":"master"},"sun":{"sha":"45c7d334","branch":"master"},"tandem":{"sha":"5388a9e4","branch":"master"}}

aadish commented 8 years ago

currently not handling multitouch issues

phetsims / isotopes-and-atomic-mass

Invisible neutrons can contribute to isotope mass #36