What portion of the electromagnetic spectrum can human eyes detect? A.
visible light

B.
visible light and infrared light

C.
infrared light

D.
infrared light and ultraviolet light

Answers

Answer 1

Answer:
Well, there's a very definite reason why a certain sliver of the electromagnetic
spectrum is called "visible".

The meaning of the word 'visible' is 'can be seen with eyes', and that's the label
given to the part of the electromagnetic spectrum that can be seen with eyes.
It doesn't include infrared or ultraviolet radiation, because those cannot be seen
with eyes. Only the 'visible' wavelengths can.

Answer 2

Answer:

Answer:

visible light

Explanation:

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In a solution, the substance that does the dissolving is called Blank Space __________.solutesolventsaturatedprecipitate
Why do fewer kinds of organism live in desert than in forest biome
2 PointsWhich of the following statements are not true about gravity? Check all thatapply.A. Gravity exists only on Earth.OB. Gravity exists between two objects that have mass.OC. Gravity is a force that pulls two objects together.D. Gravity exists in the whole universe.E. Gravity doesn't exist between Earth and the sun.
1. The force between a pair of charges is 100 newtons. The distance between the charges is 0.01 meter. If one of the charges is 2 u 10-10 C, what is the strength of the other charge?2. The force between two charges is 2 newtons. The distance between the charges is 2 u 10-4 m. If one of the charges is 3 u 10-6 C, what is the strength of the other charge?

what happens if heat flows into matter when no change of state is involved? a. both thermal energy and temperature increase b. both thermal energy and temperature decrease c. thermal energy decreases, temperature increases d. thermal energy increases, temperature decreases.

Answers

' a ' is the correct statement.

What is the period of a wave generated by anearthquake, if it has a wavelength of 500 meters and a
speed of 5,000 meters per second?

Answers

Answer:

Period T = 0.1 second

Explanation:

Given that the

wavelength = 500 meters

speed V = 5000 meters per second

The wave speed is the ratio of wavelength to period of the wave. That is,

V = λ/T

Where

V = wave speed (m/s)

λ = wavelength (m).

T = period (s)

Using the formula above gives

5000 = 500/T

Make T the subject of formula

T = 500/5000

T = 0.1 s

99pts. I can't find isotope, pottasium-15 or k-15. Is this even possible, I have a fill-in-the-blanks worksheet with a table like example:Element Name: Nitrogen-20 Symbol: N-20 Atomic Number: 7 Atomic Mass: 20 Charge: 0 Protons: 7 Neutrons: 13 Electrons: 7

I remember finding the isotope number, Nitrogen-20 by adding the Protons and Neutrons, then I get a new atomic mass. But on here Pottasium-15 is confusing! What neutrons do I add from 19 protons to get 15? Sometimes the teacher throws in impossible problems.

Answers

Yes, that's what [s]he has done this time.

First of all, the number of protons in every atom of an element
is the same. That's the "Atomic number" of the element. If
somehow the nucleus of the atom gained or lost a proton, then
that would change the Atomic number of the atom, and it would
be an atom of a different element.

Potassium is element #19. Every atom of Potassium has 19 protons
in its nucleus. Any atom that has 19 protons in its nucleus is an atom
of Potassium, and any atom that has more or less than 19 protons in
its nucleus is an atom of some other element, not Potassium.

In addition to protons, atoms also have some neutrons in the
nucleus. Neutrons have no charge, so they don't change the
atomic number of the atom. But they have mass ... almost the
same as the mass of a proton ... so the neutrons add to the atom's
"atomic weight". The atomic weight of an atom is

(number of protons) plus (number of neutrons).

The numbers you see next to the names are the atomic weights.
Notice that the atomic weight of an atom of Potassium can't be
less than 19 ... in order for it to be Potassium in the first place,
it has 19 protons, so its atomic weight would be 19 even if it had
no neutrons at all.

There can be no such thing as an atom of Potassium-15.

Atoms of the same element can have different numbers of
neutrons in their nucleii. Those are called "isotopes" of the
element.

There are three isotopes of Potassium that occur in nature ...
atoms with 19 protons plus 20, 21, or 22 neutrons. So the
atomic weight of any naturally occurring atom of Potassium
is either 39, 40, or 41. If you ever see a big chart that lists
natural isotopes of the elements, then in slot-#19, you'll see
Potassium-39, Potassium-40, and Potassium-41.

I hope my explanation is good enough for 50 points.

super super late ans but im up late n looking 4 interesting Qs...

Potassium-15 is confusing indeed! What neutrons can one add to a nucleus with 19 protons to get a mass of 15? anti-matter cannot do it as scientists have generally agreed that anti-matter has the same mass as regular matter but with an opposite spin.

the ans actually doesnt exist when the Q was originally asked but in 2017, Washington State University physicists created a fluid with negative mass. so theoretically a "negative neutron" will have a mass of -1. combining 4 of such exotic particles to 19 protons will create K-15; assuming there is no explosion from the combination.

What does the path of an object look like when it is in uniform motion ?

Answers

In uniform motion, the path is a straight line, and the object r moving along it at a constant speed.

What are some examples of convection in our daily lives

Answers

When we boil water on the stove is a good one.

Why is it important to follow all directions in an experiment carefully

Answers

it is important to follow all directions in the experiment for many reasons such as avoid getting hurt, another reason is if you do not follow all the direction you might make a mistake which could ruin the whole experiment.

Final answer:

Following directions in an experiment is crucial for accurately studying the effect of a variable, obtaining valid and repeatable results, and ensuring safety. It is integral to the scientific method, which involves making observations, forming a hypothesis, conducting an experiment, and analyzing results.

Explanation:

It's critical to follow all directions in an experiment correctly for several causes. First, experiments are a part of the scientific method, a process for investigating phenomena and acquiring new knowledge, or correcting and integrating existing knowledge. This method includes making observations, forming a hypothesis, conducting an experiment to test the hypothesis, and analyzing the results to reach a conclusion.

Second, correctly implementing the experimental procedure is necessary to measure the effect accurately and eliminate any lurking variables. It also involves control and experimental groups, which need to be treated differently only in the variable that's being tested. This way, any difference in results is attributed to that variable. Repeating the process under the same conditions confirms that your results were not accidental.

Finally, not following directions can lead to invalid results, incorrect conclusions, and even potential risks and hazards, particularly in certain fields such as chemistry or medicine. Therefore, meticulousness in adhering to instructions is essential for the reliability and safety of the experiment.