A microwave oven uses electromagnetic radiation to heat water molecules in food or drink. This radiation has a frequency of 2.45 x 10⁹ Hz. Calculate its energy
Answer:
1.62 × 10⁻²⁴ J
Explanation:
Step 1: Given and required data
Frequency of this radiation (ν): 2.45 × 10⁹ Hz (2.45 × 10⁹ s⁻¹)Planck's constant (h): 6.63 × 10⁻³⁴ J.sStep 2: Calculate the energy (E) of this electromagnetic radiation
We will use the Planck-Einstein's relation.
E = h × ν
E = 6.63 × 10⁻³⁴ J.s × 2.45 × 10⁹ s⁻¹ = 1.62 × 10⁻²⁴ J
An example of an abiotic factor that would strongly affect the population of water lilies in a pond?
Answer:
temperature, light or pH
Explanation:
why do reactions go faster at a higher temperature?
Answer:
1. Increasing the temperature increases the average speed of the reactant molecules
2. faster moving molecules in the warm reactants hit each other with more energy
Explanation:
Answer:
Explanation: At higher temperatures the particles can collide more often and with more energy. It makes the reaction take place more quickly.
Please help thank you!
John decided to cycle to his friend’s house at a speed of 28 km/h and the journey took 2 hours. How far did John cycle?
Answer:
THE ANSWER IS 56 :)))
14. A cell is placed in a salt solution that has the
same concentrations as the inside of the cell.
What will happen to the cell? *
A. The cell will shrink.
B. The cell will expand slightly.
O C. The cell will burst.
D. The cell will remain the same size.
Answer:
A
Explanation:
which scientist made the most important discovery concerning indemnifying the sun as a star
Answer: Isaac Newton
Isaac Newton, an English scientist, lived from 1642 to 1727. In 1665 he realized that it was gravity that held the solar system together.
Explanation:
BUT YOULL NEVER BE ALONEEEE
ILL BE WITH YOU FROM DUSK UNTIL DAWWWNNNNN
ILL BE WITH YOU FROM DUSK TILL DAWN
ILL HOLD U WHEN THINGS GO WRONG
ILL BE WITH U FROM DUSK TIL DAWN
ILL BE WITH U FROM DUSK TIL DAWNNNNN
Activity 7 Let's Think First
Directions: Below are possible situations during an earthquake. Encircle the letter of the appropriate action.
1. If you are outside of your house, move away from the buildings.
A. I will do it
B. I will just run anywhere.
2. If you are inside your house, get cover under a table.
A. I will do it
B. I will not do it
3. If you are in a moving car, what will you say to the driver?
A. Just keep driving.
B. Please stop.
4. Drop to the ground and protect your head.
A. I will do it
B. I will not think about it.
5. Prepare a disaster emergency kit beforehand.
A. I will do it
B. I will not do it.
Which of the following factors does NOT affect surface currents?
A. Coriolis effect
B. density
C. continental deflection
D .wind
The only factors that doesn't affect surface current from the question is B:
density.
Surface currents can be regarded as current that is been formed as a result of Earth's rotation as well as changes in temperature.Surface currents is know as one of the determinant for climate. These currents is responsible for the bringing of warm water from the equator then transfer it to the cooler parts of the ocean as a result of this heat energy is transferred.Some factors that influence surface current are; Coriolis effect : This also aid the movement of the currentcontinental deflection : this helps the deflection of the currents from the continental land masses.wind : without wind there cannot be transfer of the warm water from the equator to the part of the ocean that is cool.Therefore, Option D is correct because density does affect the surface current.
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To find the volume of a ring, the water displacement method was used.
What is the volume of the ring with correct significant figures?
Answer:
4 cm³?
Explanation:
68-64
define a shadow plz help
Answer:
A shadow is that thing that follows you everywhere when the sun is out. It's creepy!
Explanation: Hope I helped!
Answer:
A shadow is a dark form that you cannot touch, hear, feel, or taste. It's simply formed when an object blocks a source of light.
Question 2 of 10
Who developed the philosophical idea of the atom?
A. Boyle
B. Dalton
C. Aristotle
D. Democritus
SUBMIT
Answer:
The answer is D. Democritus
Explanation:
I did my research and it was Democritus' idea of the atom.
Most halogens form compounds by
(1 Point)
gaining an electron to form a negative ion.
losing an electron to form a positive ion.
losing protons.
joining with both calcium and carbon.
A piece of substance Z is heated directly and it is found that 5805 Joules of energy are needed to raise the temperature of the substance from 25.0C to 35.0C. The specific heat of substance Z is known to be 1.28 J/gc. What was the mass in grams of this piece of substance Z?
Answer:
10.0 should be your answer
Explanation:
I have had this before unless of course they changed it
In a paragraph please explain how the reactivity of potassium has increased its
value. Be sure to discuss one chemical or product that is made from potassium,
it's benefit to humans and how it is made.
Answer:
Potassium is a very high reactive metal. Exposed to water, it explodes with a purple flame. Potassium is involved in the health of cells and of blood vessels, so its reactivity has increased values, being used by scientists for blood pressure as well as lethal injection, enough could cause your heart to stop. Take bananas for example, they contain potassium, enough for humans.
Explanation:
breathe in air container more ____ than breathed out air
a hydrogen
b oxygen
c carbon dioxide
d helium
Answer:
c
Explanation:
carbon dioxide ......
The Big Bang Theory is a hypothesis that states that all matter
and energy were at one time compressed into a small volume
and then _________
Answer:
I’m not sure how they want you to answer the fill in blank.
Explanation:
The Big Bang is a theory where 14 billions years ago all matter and energy in the universe was compressed into an extremely small volume that exploded and began expanding in all directions.
The big bang theory is a hypothesis that states that all matter and energy were compressed into a small volume at one time and then expanded outward.
What is Big Bang Theory?The big bang model of the universe can be described as the model to identify the beginning of the universe. The big bang model is a cosmological model which is described by the software development life cycle.
The Big Bang theory is the dominant model of the observable universe from its beginnings to large-scale evolution. This model explains how the universe is expanded from a state of high density and temperature. It provides an explanation for phenomena, such as cosmic microwave background radiation, the abundance of light elements, and large-scale structure.
Due to the big bang as we know, the universe has been created existing about 12 - 15 billion years ago. According to the theory that the Big bang was a gigantic explosion that formed all of the energy and mass in less than a second in the universe.
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____________ acceleration involves speeding up, while ____________ acceleration involves slowing down. a. positive, negative c. positive, braking b. negative, positive d. both a and c
Answer:
Positive acceleration involves speeding up, while negative acceleration involves slowing down.
Explanation:
I am so sorry if I was wrong!
Answer:
no just no
Explanation:
Mendel also developed the law of
dominance. He did many experiments
with pea plants. This is how he came
up with the law. It shows how certain
traits come to be. One allele is
dominant. It exerts a greater influence.
He based this on an uncertain belief
that each plant carried two trait units.
One of them dominated the other.
Which sentence from this paragraph explains what a dominant allele does?
A. Mendel also developed the law of dominance
B. He did many experiments with pea plants
C. It exerts a greater influence
D. He based this on an uncertain belief that each plant carried two traits
Answer:
They mask the recessive alleles
I NEED HELP :)
A train travels 76 miles in 1 7/12 hours. What is its average speed in miles per hour?
Answer:
48 mph
Explanation:
total time= 19/12 hr
distence- 76 miles
speed- D/T=76/19/12
which is 48mph
if my answer helps please mark as brainliest.
Answer:
pretty sure its average speed in miles per hour is 48
Explanation:
I just took 76 and divided it by 1 7/12 and got 48
What is the ultimate goal of reproductive strategies?
Answer:
to accelerate progress towards meeting internationally agreed reproductive health targets and, ultimately, to attain the highest achievable standard of reproductive and sexual health for all.
Question 3 of 10
What is thermodynamics?
O A. The study of the transfer of hot and cold energy
B. The study of the movement of energy and heat
C. The study of kinetic energy and potential energy
D. The study of the conservation of matter and energy
Answer:
B
Explanation:
the branch of physical science that deals with the relations between heat and other forms of energy (such as mechanical, electrical, or chemical energy), and, by extension, of the relationships between all forms of energy.
Answer:
B
Explanation:
How do most cells in your body sense their surroundings?
O they touch things
O they see things
they smell things
they hear things
O all these answers are correct
What state does a maple tree enter during the winter?
A. thigmotropism
B. migration
C. hydrotropism
D. dormancy
How many grams are in 2.2 moles of magnesium hydroxide?
128.33g
26.51g
0.04g
Answer:
128.33g
Explanation:
brainiest plsss helpp
Answer:
[tex]\boxed {\boxed {\sf A. \ 19,320 \ kg/m^3}}[/tex]
Explanation:
We want to find the density. The formula is mass over volume.
[tex]\rho = \frac{m}{v}[/tex]
The mass is 500 kilograms. The volume is 0.026 cubic meters.
[tex]m= 500 \ kg \\v=0.026 \ m^3[/tex]
Substitute the values into the formula.
[tex]\rho= \frac{ 500 \ kg}{ 0.026 \ m^3}[/tex]
Divide.
[tex]\rho = 19230.7692 \ kg/m^3[/tex]
This is just about equal to 19,320 kg/m³, so choice A is correct.
Answer:
A) 19230 kg/ m3
Explanation:
divided it's mass by its volume ti get it's density
500/0.026 = 19230
What is the main problem with renewable energy
sources?
Answer:
biggest problem with mainstream renewable energy is intermittency.
Answer:
the biggest problem with mainstream renewable energy is intermittency.
Wind power is only generated when it's windy.
Solar power is only generated when it's sunny.
This creates several fundamental issues.
What is a chemical symbol? Give an example.
Answer:
zero two is bae
Explanation:
An atom forms an ion with a -2 charge. It is:
A:A metal in group 2
B:A metal in group 6
C:A non-metal in group 2
D:A non-metal in group 6
HELP ASAP!!
A student mixes baking soda and vinegar in a glass. The results are shown at left. Do you think any new substances are being created in this mixture? If so, how do you know?