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IrinaVladis [17]
3 years ago
11

radiowaves in the AM region have frequencies in the range 550 to 1600 kilocycles per second (550 to 1600 kh) calculate the wavel

ength corresponding to a radio wave of frequency 1.365×10^6A and 1365kh​
Chemistry
1 answer:
Ghella [55]3 years ago
4 0

Answer:

wavelength = 219.8 m

Explanation:

Data Given:

Frequency of radio wave = 1.365×10⁶ A or 1365 kHz

wavelength = ?

Solution:

As Frequency of radio wave is 1.365×10⁶ s⁻¹ or 1365 kHz

if we look for conversion of KHz to s⁻¹

So,

1 KHz = 1000

1365 kHz = 1365 x 1000 = 1.365×10⁶ s⁻¹

So

1365 kHz = 1.365×10⁶ s⁻¹

Now equation used to calculate wavelength

              f = c/λ

rearrange the above equation

             λ = c/f ........(1)

Where:

c = speed of light = 3 x 10⁸ ms⁻¹

λ= wavelength

put the values in above equation 1

              λ = 3 x 10⁸ ms⁻¹ / 1.365×10⁶ s⁻¹

               λ = 219.8 m

So the wavelength of radio wave =  219.8 m

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MaRussiya [10]

Answer:

3.01 × 10^24 atoms of vitamin D

Explanation:

The number of atoms, molecules or ions present in a substance is given by the Avogadro's number which is 6.02 × 10^23.

Hence;

1 molecule of vitamin D contains 6.02 ×10^23 atoms

5 molecules of vitamin D contains 5 × 6.02 ×10^23/1

= 3.01 × 10^24 atoms of vitamin D

7 0
3 years ago
If I want to accelerate a mass of 3 kg at 5 m/s2 then how much force should I apply?
Stolb23 [73]

<u>Answer:</u> The force that must be applied is 15 N.

<u>Explanation:</u>

Force exerted on the object is defined as the product of mass of the object and the acceleration of the object.

Mathematically,

F=m\times a

where,

F = force exerted = ?

m = mass of the object = 3 kg

a = acceleration of the object = 5m/s^2

Putting values in above equation, we get:

F=3kg\times 5m/s^2=15N

Hence, the force that must be applied is 15 N.

5 0
3 years ago
SOS TESTING:
andrezito [222]

Answer:

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Explanation:

An exothermic process is one in which heat is lost. Condensation is a change of state from gas to liquid. Thus is loses heat.

HOPE THIS HELPED

4 0
2 years ago
Calculate the mass (grams) of 0.750 moles of Al2(Cr2O7)3
garik1379 [7]

Answer:

526g is the mass of this sample

Explanation:

To solve this question we must, as first, find the <em>molar mass </em>of Al₂(Cr₂O₇)₃ using the periodic table. The molar mass is defined as the mass of this compound per mole. With this value we can find the mass in 0.750 moles as follows:

<em>Molar mass Al₂(Cr₂O₇)₃</em>

2Al = 2*26.98g/mol = 53.96g/mol

6 Cr = 6*51.9961g/mol = 311.9766g/mol

21 O = 21*15.999g/mol = 335.979g/mol

53.96g/mol + 311.9766g/mol + 335.979g/mol

= 701.9156g/mol

The mass of 0.750 moles is:

0.750 moles * (701.9156g / mol) =

<h3>526g is the mass of this sample</h3>
8 0
2 years ago
Use a periodic table to help you answer these questions if needed.
yuradex [85]

Answer:

2 Al and 3 S

Explanation:

Al2S3 so 2 Al and 3 S

3 0
1 year ago
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