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3 years ago

What is the wavelength (in meters) of an electromagnetic wave whose frequency is 2.63 × 1012 s−1?

1 answer:

4 0

To find the wavelength of an electromagnetic wave for the given frequency can be determined by using the formulaSpeed=Wavelength x FrequencyWavelength=Speed/FrequencyGenerally Speed of the electromagnetic wave is 3x10^8 m/sBy substituting the values Wavelength=3x10^8 m/s / 2.63x10^12 s^-1Wavelength=1.14 x 10^-4 metres

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EXPLAIN: How does the amount of a substance affect the rate<br> at which temperature changes?

Anton [14]

The more of a substance you have the longer the reaction will take. If you have a big pot of water and a little pot of water. The little pot will heat up quicker then the bigger pot because it does not need to fill a space up. Think of it as diffusion. When you have a 500 and 50 mL beaker, and you add a blue and red dye to them both. It will only take about a minute for the dye to almost completely mix together in the 50 mL. While the 500 mL it will take much longer for dye to mix all together then it did in the 50 mL. When it is a bigger substance it takes longer for a reaction to fully expose the substance to that reaction. If you have food, if you only have one piece of food you only need to put it in for 30 seconds to 1 minute. While if you have multiple pieces of food you will need longer time to be able to heat all of the pieces. If you have a small bowl of soup and you put it in for a minute the middle will be warm. But if you had a bigger bowl and still put it in for only a minute then the middle will be cold because you did not give it enough reaction time to heat the whole substance.

4 0

3 years ago

What is the molality of a solution prepared by dissolving 75.8 g of ethylene glycol, HOCH2CH2OH, in 1.55 L of water? Assume the

GaryK [48]

Answer:

0.787 mol.Kg⁻¹ or 0.787 m

Explanation:

Data Given:

Mass = m = 75.8 g

Volume = V = 1.55 L = 1550 mL

M.Mass of Ethylene Glycol = 62.07 g/mol

Density of water = d = 1.0 g/mL

To Find:

Molality = <u>??</u>

Molality is a unit of concentration and is defined as the number of moles of solute per Kg of a solvent.

Molality = Moles of Solute / Kg of Solvent --- (1)

First Calculate Moles of Solute as;

Moles = Mass / M.Mass

Moles = 75.8 g / 62.07 g/mol

Moles = 1.22 moles

Secondly calculate mass of water as,

mass of water = density × volume

mass of water = 1.0 g/mL × 1550 mL

mass of water = 1550 g or 1.55 Kg

Now, putting values of moles and mass of solvent in equation 1,

Molality = 1.22 mol / 1.55 Kg

Molality = 0.787 mol.Kg⁻¹ or 0.787 m

7 0

3 years ago

What is the average salinity of ocean water

pentagon [3]

3.45g/kg
Hope I helped!

5 0

3 years ago

Read 2 more answers

Melissa uses a sunscreen with an spf rating of 20. what does this does this mean?

Olin [163]

If the SPF rating is 20 then it means it would provide 20 times the protection instead of no sunscreen and 20 times longer someone would take before the person started to burn or in this case 200 minutes.

4 0

3 years ago

In a physical change, the _____ does not change.

Ksivusya [100]

Physical changes occur when objects or substances undergo a change that does not change their chemical composition. This contrasts with the concept of chemical change in which the composition of a substance changes or one or more substances combine or break up to form new substances.

7 0

3 years ago