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4 years ago

Cosmic microwave background radiation found uniformly spread throughout the universe is supposed to be _____.

Chemistry

2 answers:

slava [35]4 years ago

7 0

Answer:

Option (B)

Explanation:

The Cosmic Microwave Background (CMB) radiations are defined as one type of electromagnetic radiation which is generated after the big bang explosion. These are considered to be the remnant radio waves that are equally distributed in all the direction in space. These are not directly visible but their presence can be detected with the help of various detecting devices and instruments. One of the important significance of this wave is that it describes that the universe is constantly expanding.

Thus, these are the radio waves coming from distant galaxies.

Hence, the correct answer is option (B).

Dmitry [639]4 years ago

3 0

B. Radio waves from distant galaxies

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Why do farmers spray water over their crops before a frost?

Nezavi [6.7K]

Answer:

When water freezes and turns into ice, it releases latent heat. Then, the ice that builds up on the plant will insulate it from the colder surrounding air temperatures. Because of this, some growers choose to spray their crop with water before the freeze occurs.

Explanation:

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3 years ago

n unknown metal is either aluminum, iron or lead. If 150. g of this metal at 150.0 °C was placed in a calorimeter that contains

Nitella [24]

Answer : The metal used was iron (the specific heat capacity is $0.449J/g^oC$ ).

Explanation :

In this problem we assumed that heat given by the hot body is equal to the heat taken by the cold body.

$q_1=-q_2$

$m_1\times c_1\times (T_f-T_1)=-m_2\times c_2\times (T_f-T_2)$

where,

$c_1$ = specific heat of unknown metal = ?

$c_2$ = specific heat of water = $4.184J/g^oC$

$m_1$ = mass of unknown metal = 150 g

$m_2$ = mass of water = 200 g

$T_f$ = final temperature of water = $34.3^oC$

$T_1$ = initial temperature of unknown metal = $150.0^oC$

$T_2$ = initial temperature of water = $25.0^oC$

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

$150g\times c_1\times (34.3-150.0)^oC=-200g\times 4.184J/g^oC\times (34.3-25.0)^oC$

$c_1=0.449J/g^oC$

Form the value of specific heat of unknown metal, we conclude that the metal used in this was iron (Fe).

Therefore, the metal used was iron (the specific heat capacity is $0.449J/g^oC$ ).

6 0

4 years ago

Calculate what is the atomic number of a sodium atom that has 11 protons and 12 neutrons

fiasKO [112]

The atomic number is 11. The atomic number will always be the same as the number of protons and electrons.

4 0

4 years ago

Many organ system serve to help maintain a healthy body. The Excretory system is the organ system which is composed of sweat gla

miv72 [106K]

The removal of excess wastes helps in maintaining chemical homeostasis and prevents breaking down of systems that causes a serious health issue.

<u>Explanation:</u>

Human body is composed of many different organ system that are inter related with each other's functions. If the function of one system is disturbed then the function of other system also gets affected resulting in affecting the entire human body functions. The system that is used to remove the excess wastes and unwanted things from the human body is an excretory system. It performs tow major function in a human body. It removes unwanted things and it also helps in draining the broken down components.

The excretory system helps in the control of internal chemical homeostasis. When a living organism's physical and chemical conditions are maintained steadily it is called as homeostasis. This system also helps in maintaining the human systems in a controlled and good condition thereby preventing the failure of other systems and serious health damages.

3 0

3 years ago

Read 2 more answers

I really need help with this problem.

Aleksandr [31]

Answer:

.371 mole of NaCl

Explanation:

Na Cl Mole weight = 22.989 + 35.45 = 58.439 g/mole

21.7 g / 58.439 g/mole = .371 mole

8 0

2 years ago