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VMariaS [17]
3 years ago
13

which statement is true about the part of the electromagnetic spectrum that is visible to the human eye?

Chemistry
2 answers:
IgorLugansk [536]3 years ago
6 0
Hello @Lucysrv18,

How are you doing? In this case, we know that Electromagnetic waves that are visible to the human eye is neither made up of two electromagnetic waves nor three. Therefore B and C is incorrect.

These electromagnetic waves are divided and they are our final two options. For sure, i can say that the wavelengths in a visible electromagnetic wave are not divided into nine, but instead it is divided into 7. 

The answer to your question is A. 

Thank you,
Darian D. 

mezya [45]3 years ago
5 0

Answer: a

i JUST TOOK THE TEST

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true, in a stronger gravitational field the weight will be larger.

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exis [7]

Answer: False

Explanation: adding heat to matter results in thermal energy.

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A 62.6-gram piece of heated limestone is placed into 75.0 grams of water at 23.1°C. The limestone and the water come to a final
KATRIN_1 [288]

Answer : The initial temperature of the limestone is 1.05\times 10^{2}^oC.

Solution : Given,

Mass of limestone = 62.6 g

Mass of water = 75 g

Final temperature of limestone = 51.9^oC

Final temperature of water = 51.9^oC

Initial temperature of water = 23.1^oC

The specific heat capacity of limestone = 0.921J/g^oC

The specific heat capacity of water = 4.186J/g^oC

The formula used :

q = m × c × ΔT

where,

q = heat required

m = mass of an element

c = heat capacity

ΔT = change in temperature

According to this, the energy as heat lost by the system is equal to the gained by the surroundings.

Now the above formula converted and we get

q_{system}=-q_{surrounding}

m_{system}\times c_{system}\times (T_{final}-T_{initial})_{system}= -[m_{surrounding}\times c_{surrounding}\times (T_{final}-T_{initial})_{surrounding}]

m_{limestone}\times c_{limestone}\times (T_{final}-T_{initial})_{limestone}= -[m_{water}\times c_{water}\times (T_{final}-T_{initial})_{water}]

Now put all the given values in this formula, we get

62.6g\times 0.921J/g^{0}C \times (51.9^{0}C-T_{\text{ initial limestone}})= -[75g\times 4.186J/g^{0}C \times (51.9^{0}C-23.1^oC)]

By rearranging the terms, we get  the value of initial temperature of limestone.

T_{\text{ initial limestone}}=104.926^{0}C=1.05\times 10^{2}^oC

Therefore, the initial temperature of the limestone is 1.05\times 10^{2}^oC.




8 0
3 years ago
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IrinaVladis [17]

Answer:

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Given: Mass of books = 6.5 kg

Mass of CD's = 1.5 kg

Mass of DVD's = 2.0 kg

Total mass = 6.5 kg + 1.5 kg + 2.0 kg = 10 kg

\text {Mass percentage of books}=\frac{6.5kg}{10kg}\times {100}=65\%

\text {Mass percentage of CD's}=\frac{1.5kg}{10kg}\times {100}=15\%

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Answer: 204 L

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Thus volume occupied by 11.7 g of Helium in a balloon is 204L

6 0
3 years ago
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