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3 years ago

A certain signal produces 2.56x10^9 waves per hour (2560000000 waves/h). What is the frequency of this signal in Hertz?

Chemistry

1 answer:

Mariana [72]3 years ago

4 0

Answer: 711111.11Hz

Explanation:

Recall that the frequency of a wave is the number of cycles the wave complete in one second. Hence,

frequency = Number of wave cycles/time

Now, given that:

Number of waves cycles = 2.56x10^9 waves

Time taken = 1 hour

convert hours to seconds

(if 1 hour = 60minites,& 1 minute = 60sec)

Then, 1 hour = 60 x 60 = 3600 seconds

Frequency of this signal = ?

Frequency = (2.56x10^9/ 3600seconds)

= 711111.11Hz

Thus, the frequency of the signal is 711111.11Hz

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Answer:

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When 551. mg of a certain molecular compound X are dissolved in 100 g of benzonitrile (CH,CN), the freezing point of the solutio

arsen [322]

Answer:

1.12g/mol

Explanation:

The freezing point depression of a solvent for the addition of a solute follows the equation:

ΔT = Kf*m*i

<em>Where ΔT is change in temperature (Benzonitrile freezing point: -12.82°C; Freezing point solution: 13.4°C)</em>

<em>m is molality of the solution</em>

<em>Kf is freezing point depression constant of benzonitrile (5.35°Ckgmol⁻¹)</em>

<em>And i is Van't Hoff factor (1 for all solutes in benzonitrile)</em>

Replacing:

26.22°C = 5.35°Ckgmol⁻¹*m*1

4.90mol/kg = molality of the compound X

As the mass of the solvent is 100g = 0.100kg:

4.9mol/kg * 0.100kg = 0.490moles

There are 0.490 moles of X in 551mg = 0.551g, the molar mass (Ratio of grams and moles) is:

0.551g / 0.490mol

= 1.12g/mol

<em>This result has no sense but is the result by using the freezing point of the solution = 13.4°C. Has more sense a value of -13.4°C.</em>

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3 years ago

A student estimated the volume of a liquid in a beaker as 200.0 mL. When she poured the liquid into a graduated cylinder she MEA

Taya2010 [7]

Answer:

<h3>The answer is 0.91 %</h3>

Explanation:

The percentage error of a certain measurement can be found by using the formula

$P(\%) = \frac{error}{actual \: \: number} \times 100\% \\$

From the question

actual volume = 198.2 mL

error = 200 - 198.2 = 1.8

So we have

$P(\%) = \frac{1.8}{198.2} \times 100 \\ = 0.90817356205...$

We have the final answer as

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The density of water is 1.0 grams per milliliter. What can you conclude from this simulation about whether an object will

aliina [53]

The density of water is 1.0 grams per milliliter then it will be sink in water

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Here given density is 1.0 grams per milliliter and it will be sink in water because the density of water in 1.0 g/ml and this object is more dense than water and the density of an object determines whether it will float or sink in another substance and an object will float if it is less dense than the liquid it is placed in and an object will sink if it is more dense than the liquid it is placed

Know more about density

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1 year ago