Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bi Event Timer for Physics Lab   Ubiquitously during experiments one encounters a situation where time lapse
between two events has to measured. For example during the oscillations of a
pendulum or a vibrating reed, the powering of a lamp and achieving of its full
intensity. The powering of a relay and the closure of its contacts etc.
Situations like these call for a time measuring device between two events.
Hence this article describes a general Bi-Event timer that can be used in a
physics lab for ubiquitous time lapse measurements during experiments. These
measurements in turn can be used to interpret other parameters like velocity,
acceleration etc. The timer described here is simple to build and accurate in
performance. The Bi-event occurence can be applied as a signal to the inputs of
the timer either on separate lines or along a single path in series as voltage
pulses.

35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
10
The categories of this paper are: q-bio
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The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph