Question

1. what does a stars color tell us?

a) its chemical composition c) its temperature
b) its distance from earth d) its age

1. what is the visible surface of the sun called?

a) corona c) photosphere
b) chromosphere d) convective zone

1. which layer of the suns atmosphere is the hottest?

a) chromosphere c) corona
b) photosphere d) convective zone

1. what are the three layers of the suns atmosphere?

a) core, photosphere, corona c) radiative zone, convective zone, corona
b) photosphere, chromosphere, corona d) photosphere, corona, core

Explanation:

• Question 12: Stars emit light across a range of wavelengths. The color we see is related to the peak wavelength of this emission. According to Wien's displacement law (\(\lambda_{max}T = b\), where \(\lambda_{max}\) is the peak wavelength, \(T\) is the temperature, and \(b\) is Wien's constant), hotter stars have shorter peak wavelengths (bluer colors), and cooler stars have longer peak wavelengths (redder colors). Chemical composition is determined by spectral lines (not color directly), distance from Earth is measured using parallax or standard candles (not color), and age is more complex (involving stellar evolution models, not just color).
• Question 13: The photosphere is the visible surface of the Sun. The corona is the outermost layer (only visible during eclipses without special equipment), the chromosphere is just above the photosphere (also not the main visible part), and the convective zone is an internal layer (not directly visible as the "surface").
• Question 14: The corona has a temperature of millions of degrees Celsius, much hotter than the chromosphere (tens of thousands of degrees), the photosphere (about 5500°C), and the convective zone (which is part of the interior but cooler than the corona in terms of the atmospheric layers).
• Question 15: The Sun's atmosphere consists of the photosphere (innermost atmospheric layer we see), chromosphere (middle atmospheric layer), and corona (outermost atmospheric layer). The core, radiative zone, and convective zone are internal layers, not part of the atmosphere.

Answer:

1. C. Its temperature
2. C. Photosphere
3. C. Corona
4. B. Photosphere, Chromosphere, Corona