Answer: The radio should be tuned to 100. 0 Mhz.
Explanation:
As radio waves are electromagnetic waves, like x-rays, UV rays, and all the wavelengths of visible light, they propagate in the free space at the speed of light: 3. 10⁸ m/s.
At any wave, there is a fixed relationship between the distance travelled by the wave along one cycle (which is called wavelength ) and the speed at which the wave oscillates (which is called the frequency of the wave), with the speed at which the wave propagates, as follows:
λ (wavelength) = v (speed) / f (frequency)
Replacing by the values, and solving for frequency, we have:
f = 3. 10⁸ m/seg / 3 m = 10⁸ 1/sec = 10⁸ Hz = 100. 0 Mhz
This is the radio channel to which must be tuned in order to listen the station with a wavelength of 3 m, in the FM band.
Answer:
That it
Explanation:
There have been mass extinctions during the Cenozoic as there were during the Mesozoic and Paleozoic, but not as many animals and plants have disappeared. Finally, humanity appeared during the last two million years.The human lineage only diverged from our most recent common ancestor about 5 million years ago; less than half of 1% of that time, and modern Homo sapiens is only between 200,000 and 50,000 years old, depending on your definition.
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The numbers of residues separate amino acids that are stabilized by hydrogen bonds in α helices is 3.6 amino acid residues.
<h3>Why are amino acids called residues?</h3>
The Amino acids are known to be compounds that are said to be called residues if there is two or more amino acids that are known to be bond with each other.
Note that the amino group on one amino acid is one that tends to interacts with the carboxyl group and as such form a peptide bond.
Therefore, The numbers of residues separate amino acids that are stabilized by hydrogen bonds in α helices is 3.6 amino acid residues.
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