B. Atomic nuclei possess shells similar to the electron shells of atoms.
C. Some atoms contained more protons than electrons.
The coefficient of absorption listed on Sample A is 30%, on Sample B is 47%, and on Sample C is 62%.
When your boss asks for your choice and the reasoning behind it, what would you tell him?
A. Sample A would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the smallest.
B. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the smallest.
C. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the largest.
D. Sample A would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this
material is the largest.
Answer: The correct answer is Option C.
Explanation: For a room to be soundproof, there should be minimum reflection of the sound waves and maximum absorption of the waves.
According to the question, the coefficient of absorption is maximum for Sample C. So, this sample will reflect minimum waves and will absorb maximum waves.
Hence, this sample is the best for making the room soundproof. Hence, the correct answer is Option C.
The molar mass of calcium sulfate (CaSO₄) is approximately 136.14 grams per mole (g/mol).
To calculate the molar mass of CaSO₄ (calcium sulfate), you need to sum up the atomic masses of all the individual atoms in the chemical formula.
The atomic masses (molar masses) of the elements are as follows:
Calcium (Ca) has a molar mass of approximately 40.08 g/mol.
Sulfur (S) has a molar mass of approximately 32.06 g/mol.
Oxygen (O) has a molar mass of approximately 16.00 g/mol.
Now, let's calculate the molar mass of CaSO₄:
Molar mass of CaSO₄ = (Molar mass of Ca) + (Molar mass of S) + 4 × (Molar mass of O)
Molar mass of CaSO₄ = 40.08 g/mol + 32.06 g/mol + 4 × 16.00 g/mol
Molar mass of CaSO₄ = 40.08 g/mol + 32.06 g/mol + 64.00 g/mol
Molar mass of CaSO₄ = 136.14 g/mol
So, the molar mass of calcium sulfate (CaSO₄) is approximately 136.14 grams per mole (g/mol).
Learn more about molar masses from the link given below.
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A photon has a wavelength of 366 nm. What is the frequency of this photon?
Answer:
9. 8.2x10¹⁴ Hz
Explanation:
Wavelength λ = 366 nm
Formula: Frequency = C / λ
To find the wavelength in m,
1 nm = 1.0x10⁻⁹ m
So, 366 nm = ?
= 3.66x10⁻⁷ m
Frequency = 3.0x10⁸m.s-1 / 3.66x10⁻⁷ m
= 8.2x10¹⁴ s-1