On the Internet, Quantum Mechanics is an area of physics that is shrouded in misinterpretations. In this scenario,
scientific outreach may serve as an instrument for disseminating scientific knowledge. Especially in this context, it is important
that people's learning encompasses more than the meanings of concepts and laws, involving aspects related to the "why" and
"for what purpose" the knowledge was and is constructed. We consider these aspects as components of the sense, the connotative
and subjective dimension of conceptual learning which encompasses a positioning of an individual towards a concept and its
relevance in the physics framework. Motivated by this, in the present study, we investigated the senses ascribed to the concept
of wave-particle duality by 121 participants in a two-day (five-hour) science outreach minicourse in the double-slit experiment.
Drawing on the ideas of Franco et al. [1], we posit sensemaking as a type of cognitive effort to overcome a situation, viewed as
a self-regulatory phenomenon wherein individuals self-observe, self-evaluate, and self-react to the situation to achieve a certain
goal. In addition to identifying the senses attributed to the concept of wave-particle duality, we assessed the relationships between
these senses and participants' performance in a standardized test of this concept, as well as their educational background and
field of study. Data were collected using questionnaires answered before and at the end of the course. The senses ascribed to the
concept of wave-particle duality were investigated through similarity and cluster analysis based on responses to essay questions.
The relationships among these senses, questionnaire performance, and educational background were evaluated using nonparametric statistical tests. We infer two senses attributed to wave-particle duality: 1) wave-particle duality is a basic and
fundamental concept that impacts the way we comprehend the essence of nature, and 2) wave-particle duality is a very advanced
concept restricted to the field of Quantum Mechanics. A statistically significant correlation (0.26 was identified between the
senses attributed and participants' performance on the standardized test, suggesting that the sense ascribed to a concept and
performance in questions requiring its mobilization are overlapping elements but constitute two distinct dimensions of learning
that need to be assessed simultaneously.