To understand the interplay of observations and models you must first be able to distinguish between things that we observe and things that we infer from models. Consider the following statements about the Sun. Classify each statement as an observation or as an inference based on the current, accepted model for the Sun. Observations:___.
1. The photosphere is made mostly of hydrogen and helium
2. The photosphere emits ostly visible light.
3.The corona is hotter than the photosphere.
4. The sun emits neutrinos.
5. The sun generates energy by fusing hydrogen into helium in its core.
6. The core temperature is 10 million k
7. The convection zone is cooler than the radiation zone.
8. The composition of the photosphere is the same as that of the gas cloud that gave birth to our solar system.

The corona is hotter than the photosphere,

Explanation:

We can calculate it by applying Newton's version of Kepler's third law with Earth's orbital period (1 year) and Earth's average distance from the Sun (1 AU).

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.

we have been given a quadratic function and we need to restrict the domain such that it becomes a one to one function.

we know that vertex of this quadratic function occurs at (5,2).

further, we know that range of this function is .

if we restrict the domain of this function to either or , it will become one to one function.

let us know find its inverse.

upon interchanging x and y, we get:

let us now solve this function for y.

hence, the inverse function would be if we restrict the domain of original function to and the inverse function would be if we restrict the domain to .