Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Therefore, the correct option is option D.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
There are many uses of electromagnetic radiations in medical field. Gamma rays are used to kill the dead cells from e.g. cancer but they don’t destroy the living cells as gamma is only a wave. Electromagnetic waves and mechanical waves use matter to transmit the energy of a disturbance.
Therefore, the correct option is option D.
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What are the reactants shown in this picture???
Answer:
CH3C OOH + NaHCO3
&
NaHCO3 + H2O
Explanation:
The reactants of a chemical equatuon are always on the left side, whilst the right side is the products of the equation.
Atoms consis of mostly empty space, but in the center, you will find the nuetron holding the protons. True or False
Answer:
you will find protons and neutrons in the center of an atom.
How can scientists control the flammability of a substance?
Answer: This is simple, if it has a high flammability, and you light it on fire, then that would be a chemical change.
Explanation:
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Two atoms with different numbers of protons are what?
a)two different isotopes
b)two different ions
c)two different elements
Answer:
c) two different elements
Explanation:
A periodic table can be defined as the standard arrangement of chemical elements by atomic number, electronic configuration and chemical properties in a tabular form.
Generally, a proper representation of the mass number and atomic number of chemical elements is key and very important in chemistry.
Furthermore, as a rule, it should be noted that the mass number (nucleon number) is always larger than the atomic number(number of proton).
In the periodic table, all chemical elements are identified based on number of protons because it represents the atomic number.
This ultimately implies that, numbers of protons (atomic numbers) is used to differentiate an atom of one chemical element from the atom of another chemical element.
Hence, two atoms with different numbers of protons are two different elements.
For example, Hydrogen has one proton while Oxygen has 8 protons.
if a saline bag has a molarity of 0.155 and 0.75 L are given to a patient how many grams of NaCl did the patient receive?
Answer:
Mass = 6.79 g
Explanation:
Molarity = 0.155
Volume = 0.75L
Mass = ?
The relationship between these quantities is given as;
Molarity = Number of moles / Volume
Number of moles = Volume * Molarity
Number of moles = 0.75 * 0.155 = 0.11625 moles
Number of moles = Mass / Molar mass
Mass = Molar mass * Number of moles
Mass = 58.44277 g/mol * 0.11625 mol
Mass = 6.79 g
Which of the following correctly describes the difference (on average) between an electron in a 2s orbital and an electron in a 3s orbital?
Answer:
C: electrons is the 3s orbital are higher than those in the 2s orbital
Explanation:
Looking at the options, the correct one is that the electrons in the 3s orbital will possess more energy than those in the 2s orbital. This is because the the 2s orbitals will be filled with electrons first before the 3s orbital.
Also from basics we know that the energy of an orbital increases as the quantum number increases.
How many moles are equal to 7.28 x 1025 atoms of an element?
#Use Avogadro
Number of atoms = mol × 6×10²³
7.28 × 10²⁵ = mol × 6×10²³
mol = (7.28×10²⁵) : (6×10²³)
mol = 121.3mol
If 11.87 grams of sand (SiO2) were contained in the mixture, how many atoms of oxygen were in the mixture?
Answer:
2.38x10²³ atoms oxygen
Explanation:
To solve this question we need to convert the mass of sand to moles using its molar mass (Molar mass SiO₂ = 60.08g/mol). Twice these moles are the moles of Oxygen and using Avogadro's number we can find the amount of atoms of Oxygen in the mixture:
Moles SiO₂:
11.87g * (1mol / 60.08g) = 0.1976moles SiO₂
Moles Oxygen:
0.1976moles SiO₂* 2 = 0.3951moles oxygen
Atoms oxygen:
0.3951moles oxygen * (6.022x10²³atoms / 1mol O₂) =
2.38x10²³ atoms oxygenWhat is in our head?
A.brain
B.skull
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Answer:
In our head there is skull and inside the skull there is our brain.
Answer:
Both brain and skull is inside our head. If you meant like really inside, then the brain will be the most appropriate answer. Actually, inside our head, there is the skull and inside our skull is the brain.
1 loop in the primary coil and 8 loops in the secondary. If the secondary voltage is 120 V, what must be the primary voltage
Answer:
[tex] V_{p} = 15 V [/tex]
Explanation:
Given the following data;
Number of loops in primary coil, Np = 1 loop.
Number of loops in secondary coil, Ns = 8 loops
Voltage in secondary coil, Vs = 120V
To find the voltage in the primary coil, Vp;
Transformer ratio is given by the formula;
[tex] \frac{V_{p}}{V_{s}} = \frac{N_{p}}{N_{s}}[/tex]
Making Vp the subject of formula;
[tex] V_{p} = \frac{N_{p}}{N_{s}} * V_{s} [/tex]
Substituting into the equation, we have;
[tex] V_{p} = \frac{1}{8} * 120 [/tex]
[tex] V_{p} = \frac{120}{8} [/tex]
[tex] V_{p} = 15 V [/tex]
Therefore, the voltage in the primary coil, Vp is 15 Volts.
calculate the amount of water of crystalization in 10 g of Na2co3 .10 H2o
Answer:
the mass percentage of water of crystallization in washing soda is 62.9 %.
Explanation:
What provides the energy to set the water cycle in motion?
Nothing, the water cycle does not need energy.
Clouds
Sun
Water.
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Is calcium and fluorine
a. Nonpolar covalent
b. Ionic
c. Polar covalent
Answer:
Ionic
Explanation:
A transfer of electrons occurs when fluorine and calcium react to form an ionic compound. This is because calcium is in group two and so forms ions with a two positive charge. Fluorine is in group seven so forms ions with a negative charge.
How many grams of iodine are required to react with 3.20 g of aluminum
Answer:
use the equation moles = mass / rfm. we can't answer this because you haven't gave us the molar mass. if the question you have has 2 moles, divide the reactant by 2 to even it as well as the mass
In a 63.17 g sample of SOs, how many grams are sulfur?
Answer:
25.30 gram
Explanation:
No of moles = given mass / molar mass
No of moles = 63.17/80.06
0.7890 moles
Mass of sulphar = no of moles× molar mass of sulphar
Mass of sulphur = 0.7890×32.065
25.30 gram
Radioactive dating uses the ________ of a radioactive element to determine the exact age of a sample of rock or fossil.
A.age
B. number
C.half life
Answer:
Radioactive dating uses the age of a radioactive element to determine the exact age of a sample of rock or fossil.
Explanation:
The method of matching the profusion ratio of a radioactive isotope to a source isotope to ascertain the age of a substance is described radioactive dating. Potassium-Argon dating is the usual generally employed procedure of radiometric dating. Potassium is an ingredient in many traditional minerals and can be practiced to discover the ages of metamorphic and volcanic rocks.
What are the end products of anaerobic respiration in yeast cell ?
Answer:
glucose ethanol and co2
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Answer:
In anaerobic respiration yeast breaks down glucose, forming ethanol and carbon dioxide as its waste products. When the glucose is nearly used up, and provided that oxygen is present, yeast uses the ethanol as a respiratory substrate to produce carbon dioxide and water in aerobic respiration.
Explanation:
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Give the boiling point elevation for the following: 150 grams of H2SO4 dissolved in 2.5 kg of H2O (i=2)
Answer: b
Explanation:
Which characteristic of living organisms is described by the following definition? "The ability
to detect changes in the environment and make responses".
1. nutrition
2. sensitivity
3.movement
excretions
Answer:
it's sensitivity
Explanation:
because it's the action of sensing and reacting to something
also it was process of elimination
When white light passes through a prism, what can be discovered?
A)
White light is made invisible by passing through prisms.
B)
White light is made brighter by passing through prisms.
White light is made of a spectrum of various colors.
D)
White light gets hotter when it passes through prisms.
Answer:
White light is made of a spectrum of various colors.
Explanation:
As light passes through a prism, it is bent, or refracted, by the angles and plane faces of the prism and each wavelength of light is refracted by a slightly different amount. ... As a result, all of the colors in the white light of the sun separate into the individual bands of color characteristic of a rainbow.
which rule describes that electrons occupying the same orbital must have opposite spin? a.Aufbaus principle b. Paulus exclusion principle c. Hinds rule d.none of the above
Answer:
b. Paul's exclusion principle
Explanation:
Let's go through the definition f each of the options and eliminate the wrong answers;
a. Aufbau's principle
This principle states that electrons fill the lower energy orbitals first before moving o higher energy orbitals. This option is wrong.
b. Paul's exclusion principle
This states that no two electrons can have the same four quantum numbers. It can also be stated that; If two electrons occupy the same orbital, they must have opposite spins. This option is correct.
c. Hund's rule
This rule states that every orbital in a sub level is singly occupied before being double occupied. This option is wrong.
d.none of the above
Which best describes what occurs when heating a compound containing a
metal in the flame of a Bunsen burner?
1)Forms new atoms in the compound. When these new atoms are formed in the
compound, thes release energy as colored light.
2)Can destroy atoms in the compound. When the atoms of the compound are
destroyed, this gives off energy in the form of heat and colored light.
3)Can cause electrons in some of the metal atoms to move further away from the
nucleus. When these excited electrons return to their original locations, energy is
given off in the form of colored light.
4)can cause new nonmetal atoms to be formed in the compound. These new nonmetal
atoms release energy in the form of colored light when they are created.
Answer:
Heating compound containing a metal can cause electrons in some of the metal atoms to move further away from the nucleus.
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Explanation:
How many moles of hydrogen gas will form if 0.35 moles of Na reacts with an excess of water?
Answer:
Write the balanced reaction equation. From this, note the mole ratio of Na to H₂; this enables you to know the number of moles of H₂ produced.
This technique is in your lecture notes and/or your chemistry textbook, so you should not have to ask Quorans to do your homework. (Take the hint.)
Explanation:
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Which of the following are major influences on weather and climate?
A. global patterns of atmospheric movement
B. the physical weathering of rocks and soil
C. the cycling of water in and out of the atmosphere
D. uneven heating of the Earth by the Sun's energy
Answer:
c
the cycling of water in and out of the atmosphere
Answer:A, C, D
Explanation:
[ NaCl --> Na + Cl₂ ] How many grams of Sodium will be produced when 45.0g of Salt is decomposed completely? *
Answer:
Should be 15 grams
Explanation:
If 3 particles are produced, divide the mmass into 3 and multiply it as many times as the particle wanted repeates.
What causes waves to occur?
Question 1 options:
Wind
Animals swimming in the water
I don't know...yet!
Gravitational pull from Earth
Does gravity affect acceleration? How?
Answer: When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion. Gravity causes an object to fall toward the ground at a faster and faster velocity the longer the object falls.
Explanation:
what is the definition of a binary compound
Answer:
A Binary compound is a chemical compound comprising of only two elements
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2. How much force, in g cm / s2 , is exerted by a golf ball described in problem 1 striking a tree while accelerating at 20 cm / s2 ? Show how you can solve this problem without knowing that F = m a. Explain your solution.
Answer:
F = 1000 g cm/s²
Explanation:
Let the weight of 1 ball is 50 gram
Acceleration, a = 20 cm/s²
We need to find the force exerted by a golf ball. We know that,
F = ma
So,
F = 50 g × 20 cm/s²
F = 1000 g cm/s²
So, the required force is 1000 g cm/s².
A protein is a polymer that is made of
Answer:
A protein is a polymer that is made of amino acids.