In a compressional wave the denser the medium is at the compressions the smaller is amplitude?
Answers
I don't think I'd agree that you can characterize the amplitude of
a wave according to the density at only one point in it. After all ...
a tiny wave in steel would be much denser at a compression than
a huge wave in air would be.
The amplitude of any wave is described as the difference between
a peak and the resting value. Or even better ... half of the difference
between a maximum and a minimum.
So if you're looking at a longitudinal wave, like sound, I'd say if you
want to describe its amplitude, then you have to look at the density
at two points ... either the difference between the compression and
the resting densities, or the difference between the greatest compression
and the greatest rarefaction.
That's my opinion. I could be wrong.
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Answers
Answer:
Kinetic energy of the shot is 400 Joules
Explanation:
It is given that,
Mass of the shot, m = 8 kg
Speed of thrown, v = 10 m/s
We have to find the kinetic energy of the shot. It is given by the product of mass of an object and the square of velocity divided by 2 i.e.
KE = 400 Joules
Hence, the kinetic energy of the shot is 400 joules.
Answers
dens = mass/volume. after crushing, vol less so density more. the actual density of the metal is the same, density of can changes
Final answer:
The density of a metal can, whether it is crushed or not, remains the same because density is an intrinsic property of matter, dependent only on the mass and volume of the substance. Changing the can's shape alters its volume but does not affect its mass or its density.
Explanation:
The density of a substance is the ratio of its mass to its volume (Density = Mass / Volume). This physical property is intrinsic to the substance, meaning it doesn't change regardless of the quantity or form the material is in.
When you crush a metal can, you're changing its shape and thereby altering its volume. However, the mass remains the same because you haven't removed or added any material. As a result, the density of the metal in the crushed can stays the same as the metal's density before the can was crushed.
Let's consider a practical example: a block of brass and a piece of rebar. Both have the same mass and are made of the same metal, but the block of brass has a larger volume. Nevertheless, the densities of these substances remain constant. That's because density is an intrinsic property, reflecting the compactness of material in a substance. Hence, even though you change the can's shape (thus, its volume), you have no impact on the metal's density.
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3. By what property did Moseley suggest that the periodic table be arranged?
4. “The properties of the elements repeat periodically” defines the _____.
5. What is a period and how many are there in the periodic table?
6. What is a group (also called a family)? How many are there in the periodic table?
7. State the number of valence electrons in the following:
Element Valence Electrons
Magnesium
Phosphorous
Fluorine
Neon
8. Give the names and chemical symbols for the following:
Atomic Number Element Name Chemical Symbol
13
92
5
25
9. List, by number, both the period and group of each of these elements.
Element Symbol Period Group
Beryllium Be
Iron Fe
Lead Pb
10. Which of the following pairs of elements belong to the same period? Highlight
a. Na and Cl b. Na and Li c. Na and Cu d. Na and Ne
11. Which of the following pairs of elements belong to the same group? Highlight
a. H and He b. Li and Be c. C and Pb d. Ga and Ge
12. What group numbers are the transitions elements?
13. What are the group 1/IA elements called?
14. What are the group 2/IIA elements called?
15. What are the group 17/VIIA elements called?
16. What are the group 18/VIIIA elements called?
17. Which alkali metal belongs to the sixth period?
18. Which halogen belongs to the fourth period?
19. What element is in the fifth period and the eleventh group?
20. What is the heaviest noble gas?
21. What is the heaviest alkaline earth metal?
22. Would you expect strontium to be, chemically, more similar to calcium or rubidium and WHY?
23. List the three lightest noble gases.
24. List all of the alkali metals
Answers
Final answer:
The first published classification of the periodic table is by Dmitri Mendeleev who arranged it by atomic mass, but it was later rearranged by Henry Moseley by atomic number. This forms the basis of the modern periodic table. Various chemistry concepts related to the periodic table such as groups, periods, valence electrons, and names of certain elements are also discussed.
Explanation:
The first published classification of elements which forms the basis of our periodic table today was by Dmitri Mendeleev. Mendeleev initially arranged the elements by their atomic mass, and he noticed that the properties of elements repeated periodically when arranged in this order. However, later on, Henry Moseley suggested that the periodic table be arranged by atomic number (the number of protons in an atom's nucleus), which is how the modern periodic table is ordered.
"The properties of the elements repeat periodically" defines the Periodic Law. A 'period' in the periodic table is a horizontal row and there are 7 periods. A 'group' or 'family' in the periodic table is a vertical column and there are 18 groups.
Magnesium has 2 valence electrons, Phosphorous has 5, Fluorine has 7, and Neon has 8. The elements with atomic numbers 13, 92, 5, and 25 are Aluminum (Al), Uranium (U), Boron (B), and Manganese (Mn) respectively.
Beryllium (Be) belongs to period 2 and group 2, Iron (Fe) is in period 4 and group 8, and Lead (Pb) is in period 6 and group 14. The two pairs of elements that belong to the same period are Na and Cl, and Na and Ne. The pairs that belong to the same group are H and He, and Ga and Ge.
The transition elements are in groups 3-12. The group 1/IA elements are called Alkali metals, the group 2/IIA elements are called Alkaline earth metals, the group 17/VIIA elements are called Halogens, and the group 18/VIIIA elements are called Noble gases. The alkali metal that belongs to the sixth period is Cesium, the halogen that belongs to the fourth period is Bromine, the element in the fifth period and the eleventh group is Silver. The heaviest noble gas is Radon and the heaviest alkaline earth metal is Radium. Strontium is chemically more similar to Calcium, as they are in the same group and have the same number of valence electrons. The three lightest noble gases are Helium, Neon, and Argon, and the alkali metals are Lithium, Sodium, Potassium, Rubidium, Cesium, and Francium.
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Answers
Answers
Answer:
there it is fella atleast i tried
B.the amount of space that matter ocupies
C.how fast the particles are moving
D.amount of massin a certain place