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This article discusses the use of spectrograms to analyze bird vocalizations and simulate bird songs using a sliding whistle and a smartphone. Spectrograms provide information about the frequency, duration, pitch, and modulation of bird sounds. The article also presents examples of different bird vocalizations, such as trills and clicking sounds, and explains how they can be replicated using the sliding whistle. The use of spectrograms and smartphone applications allows students to explore the physics of bird songs and engage in interactive learning activities. The author, Regis Barille, has a background in electronics and optronics and has conducted extensive research in experimental physics and environmental metrology. [Extracted from the article]

In recent years, inorganic perovskite materials based on metallic halides have attracted significant attention due to their non-toxicity and ease of synthesis, making them suitable for various applications. This article describes the slow evaporation approach at room temperature for the fabrication of a non-toxic inorganic perovskite based on metallic halide Cs 2 ZnCl 4 . This compound crystallizes in the orthorhombic phase of the Pnma space group, as confirmed by room temperature X-ray diffraction. Through SEM-EDX studies, the morphological distribution and grain size of the Cs 2 ZnCl 4 crystal were determined. Optical investigations of our compound in the 200-800 nm wavelength range indicate that the direct band gap has a value of around 3.80 eV. The photoluminescence analysis reveals the highest emission peak at around 340 nm. By employing the Cauchy law in ellipsometry spectroscopy, the refractive index ( n ) and the extinction coefficient ( k ) were determined. Moreover, a fluorescence image of Cs 2 ZnCl 4 powder was captured using a confocal microscope. The electrical properties, including the dielectric constant, the loss factor, and the electrical modulus, have been determined in the temperature range of 313 to 433 K. Utilizing the Maxwell-Wagner effect as proposed by the Koop theory, the thermal variation of permittivity has been interpreted. The Kohlrausch-Williams-Watts equation (KWW) was used to assess the asymmetric curves of the electrical modulus., Competing Interests: The authors declare no conflicts of interest., (This journal is © The Royal Society of Chemistry.)