The work of which scientist(s) helped to explain light's ability to propagate through a vacuum?
Answers
Davisson and Germer is not the correct answer, I just finished the test. The answer has to be Maxwell I hope this helps someone else fo sho
The work of Davisson and Germer helped to explain light's ability to propagate through a vacuum. They designed and built a vacuum apparatus for the purpose of measuring the energies of electrons scattered from a metal surface. Electrons from a heated filament were accelerated by a voltage and allowed to strike the surface of nickel metal. They observed that at certain angles, there was a peak in the intensity of the scatters electron beam. The peak indicated wave behavior for the electrons.
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Look at this picture of a whale shark.Which question about whale sharks is nonscientific?A) What do whale sharks eat?B) How big is the average whale shark’s mouth?C) Does a whale shark like having a large mouth?D)What happens to the water that enters a whale shark’s mouth?Chemistry Honors College level10th grader
compact bone, marrow, periosteum, spongy bone
B
marrow, spongy bone, compact bone, periosteum
C
spongy bone, periosteum, compact bone, marrow
D
periosteum, compact bone, spongy bone, marrow
Answers
Explanation: The outer part of the bone is called the compact bone.
Final answer:
The correct order of bone layers from outside to inside is Periosteum, compact bone, spongy bone, and marrow. This corresponds to option D in your question.
Explanation:
The structure of a bone from the outside to the inside is labeled as follows: First, the outermost later is the periosteum. It is a dense layer made up of connective tissue, which provides nourishment and support. The next layer inside is the compact bone. It provides hardness and strength.
Beneath the compact bone is the spongy bone which is porous and lighter, offering shock absorption to the bone. Finally, at the very center is the marrow, responsible for the production of red blood cells. So, the correct answer is D: Periosteum, compact bone, spongy bone, marrow.
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Answer:
Average speed of the racer is 5.8 m/s.
Explanation:
Total distance covered by racer = D = 406 m
Total time taken racer= T = 70 seconds
The formula of an average speed is given by:
Average speed :
Average speed of the racer is:
5.8 m/s=406/70
1km = 100m
1h= 3600s
(5.8m/s)(1km/100m)(3600s/1h)
basic
neutral
a salt
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Answers
Answer:
This question lacks options, the options are:
a. an observation
b. a dependent variable
c. an independent variable
d. a control
The answer is D. Control
Explanation:
According to the question, a student decides to conduct an experiment to determine the effect that the amount of time spent in sunlight has on the overall growth of a plant. The student keeps all other variables needed for the plants' growth in this experiment the same/identical. These variables kept identical by the student is called CONTROL OR CONSTANT.
One of the CONTROL is the amount of water given to each plant. The amount of water given to the two plants being tested must be the same. Hence, WATER in this experiment is a CONTROL VARIABLE.
Note that, the independent/manipulable variable is the amount of time spent in sunlight while the dependent/measurable variable is the growth of the plants.
Answer:
The answer is D control
Explanation:
a. True
b. False
Answers
1. Which of the following items represents a chemical change? burning melting evaporation freezing
Answer:
- Chemeical change: Burning
- Physical change: melting evaporation freezing
Explanation:
Chemical properties depend on composition while physical properties do not depend on composition. As in case of burning, composition changes due to this , this is chemical properties while freezing, melting and evaporating process, composition remain same, so these have physical properties, like water in liquid, ice and vapor state have same composition.
2. The physical properties of a compound are similar to those of its elements.
Answer:
- False
Explanation:
- The properties of compounds are often very different from the properties of the elements that make them. For example, water is made from two atoms of hydrogen bonded to one atom of oxygen. H2O have different physical properties than oxygen and hydrogen.
Final answer:
In the context of Chemistry, 'Burning' is a chemical change as it results in new substances. The claim that a compound's physical properties are similar to its elements is typically false as the properties often differ significantly, an example being the difference between water and its constituent elements hydrogen and oxygen.
Explanation:
The question falls under the field of Chemistry. It refers to the concept of chemical and physical changes in matter. A chemical change is a change in matter that results in the formation of one or more new substances with new properties. On the contrary, a physical change relates to a change in the state of matter without any change in its chemical composition. Out of the options given, the process of 'Burning' symbolizes a chemical change as it results in the formation of new substances such as carbon dioxide, water vapor, etc.
As for the second part of your question, the statement that 'physical properties of a compound are similar to those of its elements' is generally false. The properties of a compound often differ greatly from those of the constituent elements. One classic example is that of water (H2O). Water is a liquid at room temperature, quenches thirst, and is essential for life. However, its constituent elements - Hydrogen and Oxygen - are both gases and do not possess these characteristics.
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