Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Cornu's spiral in the Fresnel regime studied using ultrasound: A phase
  study   A simple experimental technique for measuring the phase and amplitude of
diffracting ultrasound wave [A. Hitachi and M. Takata, Am. J. Phys. 78, 678
(2010)] has been applied to diffracting objects with straight edges as a
demonstration of the Cornu spiral. Babinet's principle is studied observing the
ultrasound field behind a slit and a complementary strip obstacle and is
verified directly by comparing vectors (phasors) in the complex plane. The
phase of the diffracted wave observed in the geometrical shadow of the straight
screen has the form of a cylindrical wave originating at the edge of the
straight screen as the boundary diffraction wave proposed by Young. In
addition, the incident wave has a phase delay of pi/4 behind the wave passing
through on the center line of the slit, the plane of symmetry, has been
observed as predicted by Huygens-Fresnel diffraction theory.

22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex