Journal of Physics and General Science

Impact of Street Lighting on the Growth and Yield of Hom Pathum Off-Season Rice in Nong Lan Subdistrict, Tha Maka District, Kanchanaburi Province

2025-06-21T13:29:43+07:00

This research aims to evaluate the impact of roadside lighting on the growth and yield of Hom Phatum rice in Nong Lan Subdistrict, Mueang District, Kanchanaburi Province, and to analyze the relationship between light intensity and distance from the light source affecting the growth and yield of rice in the paddy fields of Kanchanaburi Province. The experiment was conducted using a Completely Randomized Design (CRD), divided into four levels of light intensity (0, 0–50, 51–100, 101–150 lux), with five replications. The roadside lighting significantly affected the physiological and phenological changes in rice, showing an increase in plant height to 97.7 cm compared to 85.4 cm in the control group. Leaf area and biomass increased by 18.5 g/plant in the illuminated areas, while flowering was delayed to 93.8 days compared to 85.3 days in the control group. Yield per area increased to 729.8 kg/rai compared to 650.3 kg/rai in the control group (rai is a Thai unit of area, approximately 0.16 hectares). However, the percentage of good seeds decreased by 3.8 %. These findings highlight the complexity of the effects of roadside lighting on rice production and emphasize the importance of considering the interactions between infrastructure development and agriculture in land-use planning for rural areas of Thailand.

The Effect of the 5E Inquiry-Based Learning Model Combined with the Kamol Model on Physics Problem-Solving Skills in Wave Optics Among Grade 11 Students

2025-06-21T13:29:45+07:00

This study aimed to evaluate the effectiveness and efficiency index of implementing the 5E Inquiry-Based Learning Model combined with the Kamol model on students' academic achievement, problem-solving skills in physics, and satisfaction levels. The participants were 41 Grade 11 science-mathematics students, selected through purposive sampling. The research instruments included: (1) lesson plans based on the 5E Inquiry-Based Learning Model integrated with the Kamol model; (2) a 20-item multiple-choice test assessing pre- and post-instruction achievement in wave optics; (3) a 10-item problem-solving skills assessment using a 5-point Likert scale; and (4) a 15-item satisfaction questionnaire, also employing a 5-point Likert scale. Data analysis utilized percentage, mean, standard deviation, and t-tests. The findings indicated that the instructional approach achieved an effectiveness score of 74.51/74.02 and an efficiency index of 0.65. Post-instruction academic achievement (x̄ = 14.80, SD = 1.32) was significantly higher than pre-instruction scores (x̄ = 5.10, SD = 2.14) at the 0.01 significance level. Additionally, 92.68 % of students surpassed the 70 % achievement benchmark. The average problem-solving skills score was 4.30 (SD = 0.05), categorized as high, and overall satisfaction with the instructional approach was rated at 4.38 (SD = 0.11), indicating a high level of satisfaction.

Assessment of Annual Effective Radiation Dose from Radon Gas Contamination in Hot Spring Water and Domestic Water in the Khuan Sa Hot Spring Area, Palian District, Trang Province, Southern Thailand

2025-06-21T13:29:46+07:00

The Khuan Sra Salty Hot Spring, located in Suso Subdistrict, Palian District, Trang Province, was discovered over 100 years ago. Later, it received funding from the Thai Niyom Yangyuen (Sustainable Thai-ism) project for development and expansion, making it available to the public, tourists, and visitors for mineral water soaking therapy. However, this salty hot spring originates from fissures in the Earth's crust, which may allow radon gas to diffuse from the water into the atmosphere, posing potential health risks. This study aimed to examine the physical characteristics and measure radon gas concentrations in the salty hot spring and domestic water (including tap water and groundwater), as well as assess the annual effective radiation dose from ingestion and inhalation. A total of 27 water samples were collected from the salty hot spring and domestic water sources. The results revealed that the average values for temperature, pH, electrical conductivity, total dissolved solids (TDS), salinity, and dissolved oxygen (DO) in the salty hot spring were 42.8±1.42°C, 6.67±0.46, 1.52±0.03 S/m, 8.53±0.18 g/L, 8.84±0.18 ppt, and 8.16±0.53 mg/L, respectively. In contrast, domestic water sources had average values of 27.2±0.67°C, 7.06±0.46, 0.02±0.01 S/m, 0.10±0.06 g/L, 0.10±0.06 ppt, and 7.89±0.20 mg/L, respectively. The average radon concentration in both the salty hot spring and domestic water was 33.48±10.11 Bq/L, exceeding the standard limit for radon contamination in drinking water (11.1 Bq/L). However, when estimating radon diffusion from the water into the atmosphere, the average concentration was 3.35±1.01 Bq/m³, which is below the global outdoor average (15 Bq/m³). Additionally, the estimated average annual radiation dose was 92.88±6.95 µSv/y, within the reference level (100 µSv/y), while the background radiation level was 1.50±0.19 mSv/y.