<h2>
Answer: 1.22 × 10⁻¹ m</h2>
<h3>Explanation:</h3>
Wavelength = Speed of Light ÷ Frequency
= (2.99 × 10⁸ m/s) ÷ ( 2.45 × 10⁹ /s)
= 1.22 × 10⁻¹ m
The wavelength of a light of frequency 2.45 × 10⁹ /s is 1.22 × 10⁻¹ m.
<u>Notes:</u>
Hz ≡ /s
Which among the following will make lime water look milky
option C) Ca(OH)₂
The presence of a large population of sludgeworms indicates water depleted of oxygen and a high level of organic pollution.
The sludgeworms Tubifex is harvested and sold as tropical fish food since it is common near sewer outlets and serves as a sign of water or organic pollution. Polychaetes are crucial in rearranging the silt on the ocean floor.
Organic contamination happens when too much organic material, such sewage or manure, gets into the water.
There will be more decomposers and sludgeworms in a pond as the organic content accumulates. These decomposers and sludgeworms develop quickly and consume a lot of oxygen as they do so.
Hence, Sludgeworms are a sign of an abundance of oxygen-depleted water and significant levels of organic pollutants.
Learn more about Water pollution here brainly.com/question/1235358
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We can measure the properties of several unknown solids by some of the characteristics :
Covalent.
Ionic.
Metallic.
Network covalent.
<span>covalent bonds are weaker than ionic and create molecular compounds. these have low melting and boiling points.
</span>
<span>ionic compounds are very strong bonds, it takes a lot of energy to melt and boil these compounds. these are brittle compounds.
</span>metallic bonds are found in metals, of course. these are described as "sea of electrons" because the valence elctrons of each metal atom can freely move between the metal atoms in the crystal. this is what allows for electric conductivity in metals, the easy flow of electrons through the metal.
<span>network covalent are covalent bonds. the are different from covalent bonds because they are much stronger bonds. a diamond is made only of C. one sees in other compounds that carbon bonds are covalent and weaker than ionic. in a diamond, the C atoms are in a network of covalent bonds and, as we see everyday, graphite, also only carbon, is so weakly held together that we can rub the tip of a pencil and the C comes off on our hands</span>