The graph above is a schematic spectrum of the planet Mars; Mars reflects visible sunlight and emits infrared light, refer to the numbered features of the graph and answer the following question.
Which portion(s) of the spectrum represent(s) reflected sunlight?
a. 1 only
b. 2, 3, and 4
c. 3 and 6
d. the entire spectrum

The graph above is a schematic spectrum of the planet Mars; Mars reflects visible sunlight and emits infrared light, refer to the numbered features of the graph and answer the following question.
Which of the six numbered features represents absorption lines?

The figure above, shows the approximate depths to which different wavelengths of light penetrate Earth’s atmosphere. Use this figure to answer the following question.
The figure above, shows the approximate depths to which different wavelengths of light penetrate Earth’s atmosphere. Use this figure to answer the following question.
(Choose all that apply.) Observatories on mountaintops can detect
a. visible light
b. X rays
c. a small portion of the infrared spectrum
d. very-long-wavelength infrared light
e. radio waves

The graph above is a schematic spectrum of the planet Mars; Mars reflects visible sunlight and emits infrared light, refer to the numbered features of the graph and answer the following question.\Which of the six numbered features represents emission lines?

Does red light have a higher or lower energy than blue light? Does red light have higher or lower frequency than blue light? Does red light have a longer or shorter wavelength than blue light?

The figure above, shows the approximate depths to which different wavelengths of light penetrate Earth’s atmosphere. Use this figure to answer the following question.
Only very small amounts of infrared and ultraviolet light can penetrate all the way to the ground. Based on the diagram, which statement is true?
a. A small percentage of the incoming light at every infrared and ultraviolet wavelength reaches the ground, while the remaining light at the same wavelengths does not reach the ground.
b. Most infrared and ultraviolet wavelengths do not reach the ground at all; the only wavelengths that do are the ones closest to the visible portion of the spectrum.
c. Most infrared and ultraviolet wavelengths do not reach the ground at all; the only wavelengths that do are the ones closest to the radio and X-ray portions of the spectrum.

how many jupiters can fit inside the sun

Why do we say that light is an electromagnetic wave? Describe the relationship among wavelength, frequency, and speed for light.

Choose the best answer to given of the following. Explain your reasoning with one or more complete sentence.
Radio waves are
(a) a form of sound.
(b) a form of light.
(c) a type of spectrum.

Method of Eratosthenes I. You are an astronomer on planet Nearth, which orbits a distant star. It has recently been accepted that Nearth is spherical in shape, though no one knows its size. One day, while studying in the library of Alectown, you learn that on the equinox your sun is directly overhead in the city of Nyene, located 1000 kilometers due north of you. On the equinox, you go outside and observe that the altitude of your sun is 80degree. What is the circumference of Nearth?

Why is DNA replication called semiconservative?

Choose the best answer to given of the following. Explain your reasoning with one or more complete sentence.
Compared to red light, blue light has higher frequency and
(a) higher energy and shorter wavelength.
(b) higher energy and longer wavelength.
(c) lower energy and shorter wavelength.

Describe the life history of a protostar from its beginning as part of a molecular cloud to the moment hydrogen fusion begins. Give as many details as possible. How would that life story be different if the protostar formed in a cloud without any angular momentum?

Choose the best answer to given of the following. Explain your reasoning with one or more complete sentence.
Why is a sunflower yellow?
(a) It emits yellow light.
(b) It absorbs yellow light.
(c) It reflects yellow light.