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Charra [1.4K]
3 years ago
6

Which of the following statements about electromagnetic and mechanical waves is true?

Chemistry
1 answer:
mr Goodwill [35]3 years ago
4 0

Answer:

B. Mechanical waves must travel through a medium, but electromagnetic waves do not require a medium.

Explanation:

A wave is defined as any disturbance that transmits energy from one point to another.

Waves can be typically classified as either mechanical or electromagnetic waves.

Mechanical waves are waves that requires a medium for their propagation. In a vacuum, they cannot be propagated and would not cause any disturbance. An example is sound waves.

Electromagnetic waves do not require a medium to be propagated. They can pass through any substance in nature. Electromagnetic radiations belongs to this class.

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d1i1m1o1n [39]
The answer is 4.5 because you add rhem
6 0
3 years ago
Need help on this question asap pleasee
algol [13]

Answer:

9.0 moles of CaO

Explanation:

We have the reaction equation as follows;

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Now we know from the equation that;

1 mole of iron III oxide yields 3 moles of CaO

Therefore;

3 moles of iron III oxide yields 3 * 3/1

= 9.0 moles of CaO

6 0
2 years ago
The students in the picture below are using a globe and a lamp to model the Sun and the Earth. If the model Earth acts the same
timofeeve [1]

Answer:

The only one that makes sense IF the model behaves as the Earth is D.

Explanation:

7 0
3 years ago
In the following reaction, 451.4 g of lead reacts with excess oxygen forming 365.0 g of lead(II) oxide. Calculate the percent yi
user100 [1]
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MM(Pb) : MM(PbO)
=207.21 : 223.20  =  451.4 g : x g

cross multiply and solve for x
x=223.2/207.21*451.4
= 486.23 g

Percentage yield = 365.0/486.23= 0.75067 = 75.07% (rounded to 4 sign. fig.)

4 0
3 years ago
Temperature in degrees Fahrenheit can be converted to Celsius by first subtracting 32, then dividing by 1.8. What is the Celsius
kap26 [50]

Answer:

31.1°C

Explanation:

Given parameters:

  Temperature = 88°F

The formula of the to convert is:

         T°F = T°C - 32  / 1.8  = \frac{TC - 32}{1.8}

Now input the parameters and solve;

       T°F =\frac{ 88  -32}{1.8}

      T°F = 31.1°C

7 0
2 years ago
Read 2 more answers
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