Characterization of linear light sources with the smartphone’s ambient light sensor

Presented in this article is an alternative and cost-effective method for measuring Planck's constant with light-emitting diodes (LEDs). Essential in the presentation is the apparent linear plot of the voltage against light intensity associated to each LED; such a plot reveals the threshold or minimum voltage that turns on the LED. Those threshold voltages associated to all LEDs used are theoretically related to the frequency of the emitted light and to the Planck's constant. Hence, in the experiment presented, the determination of the value of Planck's constant to be equal to 6.1(±1) × 10 −34 Js. This result is in error by 7.9% in comparison to the accepted value of 6.626 075 54 × 10 −34 Js but it appears to be good enough for educational use.

Section: F R O N T L I N Ementioning

confidence: 99%

Smartphone-based measurement of the Planck’s constant with light-emitting diodes

Pili¹,

Violanda²

2019

“…These experiments are proven to foster students' motivation and independence which positively impacts their academic performance. However, in this broad range of works some topics are more represented than others, such as mechanics [2,3], oscillations, [4] beats, [5] acoustics, [6] and optics [7]. The published work on electromagnetism using smartphone sensors * Author to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

RLC series circuit made simple and portable with smartphones

Torriente-García,

Martí,

Monteiro

et al. 2023

This article presents a novel method for studying RLC series circuits using two smartphones, one used as a signal generator and the other as an oscilloscope. We measure the voltage at the external resistor as a function of frequency when subjected to a sinusoidal electromotive force. The experimental results demonstrate a remarkable agreement with the theoretical curve for the voltage at the resistor and the resonance frequency, validating the accuracy of the smartphone-based setup. The experiment fills the gap in educational materials related to electrical circuits and provides a portable alternative to traditional, expensive laboratory equipment.

“…Over the last decade, a significant amount of published work has covered various fields of physics like the motion of objects [1,2], general * Author to whom any correspondence should be addressed. physics [3][4][5], optics [6][7][8], acoustics [3,9,10], magnetism [11][12][13], etc. using smartphone sensors.…”

Section: Introductionmentioning

confidence: 99%

Determination of the magnetic moment of a magnet by letting it fall through a conducting pipe

Pal,

Sarkar,

Panchadhyayee

2023

A novel method is proposed to determine the magnetic moment of a magnet by studying its free-falling motion inside a non-ferromagnetic and conducting pipe. The dynamics of a neodymium magnet falling inside a pipe is tracked by using sound waves of a fixed frequency generated by one smartphone and detecting acoustic resonance in the pipe simultaneously by the other. This tracking technique leads to the measurement of the terminal velocity of the falling magnet, as the interaction between the magnet and the conducting pipe produces a force, similar to viscous drag, on the falling magnet. The result obtained is verified by studying torsional oscillations of the suspended magnet and conforms to the reported value in such a low-cost setup. The experiment is designed with concepts integrating the domains of general physics, electromagnetic induction, and acoustics.