By P. Hawthorne
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Extra info for A Science Teacher’s Companion to the BBC Microcomputer
The othe~ main variables are 'E' the electric field strength, in Vim. 'B' - the magnetic field strength, in T. 'amu' - the value of the atomic mass unit, in kg. e - the charge on the electron, in C. PROCchoose_sample is self explanatory. If you want to add extra data the format for the DATA statement is identification letter, chemlcal symbol, number of isotopes, mass of first isotope, relative abundance, mass number, mass of second isotope, etc. ) PROCadjust_B waits for one of the control keys to be pressed (1550-1570) and then takes suitable action.
But it also has a serious purpose: to teach the effect of angle of projection on the trajectory and horizontal range of a projectile. Hopefully students will discover for themselves that 45 degrees gives maximum range, without the need for any 'trig'. They will also find that this is not always the best angle to use (there is a 'mountain' in the way) . PROC/FN List 400 PROCland draws the landscape with gun turrets at the points (LGUNX%,LY%) and (RGUNX%, RY%) . 550 PROCplot plots the shells trajectory and checks for a hit on the ground or a gun turret.
The SOUND channel (C), amplitude (A), pitch (P) and duration (D) have values assigned in line 420. REACTION TIMING ("REACTION") Apart from being a useful program which allows the investigation of the subject's reaction time and its possible dependence on the type of stimulus used, "REACTION" illustrates the use of the user port and the storage of experimental data as files on tape or disk. To protect the keyboard from over-enthusiastic subjects who can be inclined to give it a bashing, the program uses a separate push-button switch connected to the 'B7' line of the user port see chapter 3 for connection details.