navy blue angles

The dress code for a school event was to wear a navy blue tie, but 20 of them wore white ties. What is the experimental probability that a student wears a white tie, if the number of students in the school is 3000 ? => 1000 or 1 120 or 1 150 or 1 200..

Inside the caravan, I stood on a chair and lit the oil lamp in the ceiling. I had some weekend homework to do and this was as good a time as any to do it. I laid my books on the table and sat down. But I found it impossible to keep my mind on my work. The clock showed half past seven. This was t..

When a strong beam of light is passed through a colloidal solution, the path of the light becomes visible when viewed from a direction at right angle to that of the incident light. This occurs because the colloidal particles absorb light energy and then scatter it in all directions. The p..

. The wavelengths absorbed appear as dark lines or bands on a bright background. According to Kirchhoff's law an element can absorb only those wavelengths from continuous light, which it emits at the same temperature. This law was used to study structure of the Sun when Fraunhoffer explained existe..