in a particular inertial frame s, two events occur a distance c△t apart and one event occurs before the other by a time at. an observer who is travelling at speed v relative to s in a direction parallel to the line joining the events notes that the events are only δt/2 apart. determine v/c. 8 marks c) a second observer is travelling in the same direction as the first observer but at a speed of 4c/5 as measured in s. in terms of δt, what is the time interval between the events according to this observer? [5 marks) d) what is the speed of the second observer as determined in the rest-frame of the first 6 marks observer?

In a laboratory, nakisha mixes sodium hydroxide solution with an indicator called phenolphthalein. when combined, they create a pink solution. nakisha wonders if mixing other solutions with phenolphthalein will also create this pink color. how could she use the scientific inquiry process to explore it further?

If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?

Antireflective coatings on solar cells are often made by applying a thin film of silicon nitride (sinx), which has an index of refractive of 1.2, on the top of the silicon solar cell, which has a refractive index of about 3.5. however, the sun emits radiation of various wavelengths which the solar cell absorbs, and the antireflective coating can only absolutely minimize the reflection of one of these wavelengths. the coating thickness is chosen to reduce the reflection of green/yellow light (e = 2.2 ev), which is the most intense color in the solar spectrum (shown below). which of the following coatings would minimize reflection of green/yellow light? the answer is 820 nm how? what is the angular width of the central maximum of an electron traveling at 2 x 108 m/s going through a single slit of width 1 mm.