Answer:
Areas where the rocks have a reversed polarity
Explanation:
The rocks are an excellent natural indicator about the past of the magnetic field of the Earth and its changes. This is due to the direction of the metallic crystals, which always point toward the strongest pole. While in the present, the North Pole is the one that has the stronger magnetic field, it has not been like that always in the past, but there has been periods when the South Pole has been the stronger one. This can be seen by some rock samples found in the oceans, as their crystals are pointing toward what is now the South Pole, not as the newer rocks that point toward the stronger North Pole, meaning that the South Pole had the stronger magnetic field in certain periods of the past, which can be determined by the age of the rocks.
Pi is not involved in the calculation of a triangle's area.
If you're using 'R' to represent 'Radius', a triangle doesn't
have one of those either.
So neither pi nor R is involved in the area of a triangle.
Answer:
Robert Hooke
Was the first to use the word "cell"
Observed cork cells
Anton van Leeuwenhoek
Observed "animalcules"
Used polished lens
.
Explanation:
Anton van Leeuwenhoek is known as father of microbiology. He is credited to improve the quality of lens in microscope. His first observation of organisms called animalcules.
He is credited to have build microscope that could get magnified by 200 times. He used word animalcules for small organisms from pond water when first observed in microscope. He discovered protozoa and named it animalcules".
Robert Hooke is famed for discovering cell from a cork of plant. He observed a compartment or honey comb like divisions when observed these cork cells under the microscope and named it cell. He was only able to see the cell wall as the cork cells are dead cells.
The time it takes the Polonium-194 to decay to 1/16 of its original amount is 2.8 seconds.
<h3>What is half-life?</h3>
half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay
To calculate the time it takes the sample of Polonium-196 to decay to 1/16 of its original amount, we use the formula below
Formula:
- = R/R'......... Equation 1
Where:
- n = Total number of time it takes Polonium-194 to decay to 1/16 of its original amount
- t = Half-life of Polonium-194
- R = Original amount of Polonium-194
- R' = Amount of Polonium-194 after decay
From the question,
Given:
Substitute these values into equation 1 and solve for n
Equating the base,
- n/0.7 = 4
- n = 0.7×4
- n = 2.8 seconds.
Hence, the time it takes the Polonium-194 to decay is 2.8 seconds.
Learn more about half-life here: brainly.com/question/25750315
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