Ce unitate de masura are indicele de REFRACTIE?

Answers

Answer 1

Answer:se obesrva ca indicele de refractie NU are unitate de masura, este adimensional. Se exprima print-un raport, de exemplu 4/3, 1,5 etc.

Explanation:


Related Questions

Use the velocity vs time graph to analyze the motion of the object.

Answers

Explanation:

the object has constant velocity for 2 seconds and it get a constant accelration (2ms-2)

Differentiate elastic potential energy and chemical potential energy​

Answers

Answer: Elastic energy is the energy store in a.. compacted spring; an extended elastic band; and a drawn bow.  

Chemical potential energy​​ is position of electrons in specific substance bonds that can be broken (energizes).

:

This stored energy is released and performs work when the elastic material reverts back to its original position. ... In comparison, chemical potential energy, is the energy released during the formation of chemical compounds.

what is lighting and lighting conductor​

Answers

Lightning happens when the negative charges (electrons) in the bottom of the cloud are attracted to the positive charges (protons) in the ground.


A lightning rod (US, AUS, CA) or lightning conductor (UK) is a metal rod mounted on a structure and intended to protect the structure from a lightning strike

If a 160W light bulb consumes 1000J of electrical energy in a given time, then in the same time interval, how much energy will a 40W light bulb consume?


Answers

160w/4 = 40w
1000J/ 4= 250J
a 40w light bulb will consume 250J

Answer:250J

Explanation:

160*t=1000

40* 1000/160= 250

What are tadpoles? How does it look like

Answers

Answer: a tadpole is the first or second step into the evolution for a frog

Explanation: a frog starts with the egg then it becomes a tadpole for 6 to 12 weeks before it can start going out the water.

Answer:

Tadpoles are baby frogs. The tadpole looks like a frog with a tail and becomes a froglet around 12 weeks after hatching. The tadpole becomes an adult frog around 13 to 16 weeks after hatching.

Explanation:

I also attached a photo for you

Brainliest or rating please and thank you

HELP
How do i find the centripetal acceleration and force from the mass and radius????
I wasn't given any velocity value please help

Answers

Answer:

"ac = v2/r"

This is the formula and is the main step to learning about how to figure out the centripetal acceleration and force from mass and radius.

which nuclear decay emission consists of energy only?

Answers

Gamma radiation, it’s a decay emission of pure energy :)

Answer:

Gamma radiation

Explanation:

Gamma radiation is a decay emission of pure energy.

Explain why the coin is able to float on top of the water in this glass.

Answers

Answer:

Surface tension is the result of water molecules pulling inward with a strong attractive force. This attractive force brings the molecules on the surface of the water close together and causes the surface of the water to be drawn toward the water molecules beneath the surface. Since there are no water molecules above the surface, there are uneven forces. This causes surface tension, allowing the coin to float on the water’s surface.

Explanation:

Brainliest pls

a large bottle contains a number of medicinal tablets each having a mass of 250mg the mass of all the tablets is 0.5kg calculate the number of tablets in the bottle​

Answers

Considering the change of units and rule of three, the number of tablets in the bottle is 2,000.

First of all, you know that each medicinal tablet has a mass of 250 mg, while the mass of all tablets is 0.5 kg. You can see that the measurements are in different units of measurement, so you must make a change of units so that they are in the same units.

So, knowing that 1 kg is equal to 1,000,000 mg, you can apply the following rule of three: if 1 kg is equal to 1,000,000 mg, 0.5 kg is equal to how many mg?

1 kg ⇒ 1,000,000 mg

0.5 kg ⇒ x mg

So: [tex]x=\frac{0.5 kgx1,000,000 mg}{1 kg}[/tex]

x= 500,000 mg

Then, you know that each medicinal tablet has a mass of 250 mg, while the mass of all tablets is 500,000 mg. Now that the values ​​are in the same units, to calculate the number of medicinal tablets you must apply the following rule of three: if 1 tablet has a mass of 250 mg, how many tablets have a mass of 500,000 mg?

[tex]number of medicinal tablets=\frac{500,000 mgx1 tablet}{250 mg}[/tex]

number of medicinal tablets= 2,000

Finally, the number of tablets in the bottle is 2,000.

Learn more:

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How does the study of light provide knowledge about stars, galaxies, and the universe’s beginning?
Answer in 3 to 4 sentences.

Answers

Answer:

from spectral lines astronomers Can determine

Identify some sports or activities you can do to improve your overall health and explain how physical activity can improve your

Answers

Answer:

foot ball.

Explanation:

exercise is the specific method which helps one's own health both physical and mental health. Mental hygienic is purely rely on the physical health well-being. playing the football needs to run from one station or position to another positiin. in the due process, the flow of blood of the individual circulate faster than other rest days as a result of this, fats in the arteries are burnt down.Blood pressure remains constant as always. Diabetes will be free for the people who plays football because carbohydrates are also burnt down into simpler form of the substance thereby releasing the required amount of energy.

what is the initial velocity of an object thrown straight up that takes 5 seconds to reach its highest point?

Answers

Answer:

50 [m/s].

Explanation:

1) formula is: V-V₀=g*t, where V₀ - final velocity (it is 0), V - required initial velocity, g≈10 [m/s²] and t - elapsed time.

2) according to the formula above:

V=g*t; ⇒ V=5*10=50 [m/s].

Zeb was moving his dresser. He pushed with 1000N and the resulting acceleration was 200m/s2. What was its mass?

Answers

Answer:

5

Explanation:

Formula for Mass (for this question)

[tex]mass=\frac{Force}{Acceleration}[/tex]

mass= 1000N/200[tex]m^{2}[/tex]=5

(pls do correct me if I have any mistakes it would rlly help others!)

21/33

A crane is lowering a 50 kg box. If the crane lowers the box at a

constant speed, what is the tension Fr in the cable?

Answers

Answer:

400N

Explanation:

if v= 4.3 + 1.2% and I = 2.1A + 4.5% find the resistance and significant figures

Answers

This equals to a v=78.9(*5%)

To which kinds of objects do Newton's laws of motion apply?



only objects flying


only objects going down a hill


all objects


only objects rolling

Answers

Answer:

All objects

Explanation: Did test

explain why you cant see our reflection better in a piece of metal

Answers

Answer:

metal and glass are very smooth and reflect light back more directly this is called specular reflection if you look into a lake on a wide windless day you will be able to see your reflection because of the smooth surface of the water is producing the specular reflection rather than diffuse reflection

A ball is thrown straight up from the ground with an unknown velocity. It returns to the ground after 4.0 s. With what velocity did it leave the ground?

Answers

Answer:

It must return at the same velocity with which it was thrown or else there would be a preferred direction of motion leading to perpetual motion.

a = (v2 - v1) / t = (v2 - 0) / 2 = v2 / 2    for a falling object

v2 = 2 a = 2 sec * 9.8 m/sec^2 = 19.6 m/s

You can check with

H = V0 t - 1/2 g t^2      (V0 and g are in different directions)

H = 0

V0 = 1/2 g * 4 = 19.6 m/s

it is important to realize that an element’s line spectrum can include emissions at wavelengths throughout the electromagnetic spectrum including ultraviolet, visible, and infrared. according to the procedure in section 2, where will you be collecting data on hydrogen and helium’s line spectra?

Answers

Answer:

visible region

Explanation:

According to the procedure in section 2, in visible region the data collected on hydrogen and helium’s line spectra.

What is electromagnetic spectrum?

Electromagnetic spectrum are the wave which is form of energy and includes the waves such as radio waves, gamma waves, visible light waves etc.

An element’s line spectrum can include emissions at wavelengths throughout the electromagnetic spectrum including ultraviolet, visible, and infrared.

Types of electromagnetic spectrum-

Radio waves-Radio waves are used to broadcast the signal and television signals.Microwaves-Microwaves are used in the mobile signals, Radar and in cooing the food.Infrared-Infrared transmit heat from difference sourced of fire.Visible light-This is the type of electromagnetic radiation, which is visible to the human eye.Ultraviolet-Ultraviolet electromagnetic radiation used in florescent tubes.X-rays- X-rays are used to see throughout the objects and the bodies.Gamma rays- Used in medical, to kill the cell causes cancer.

The hydrogen line spectra fall between wavelength, 410 nm to 656 nm. The helium line spectra fall between wavelength, 400 nm to 781 nm.This two fall in the visible region of line spectra.

According to the procedure in section 2, in visible region the data collected on hydrogen and helium’s line spectra.

Learn more about the electromagnetic radiation here

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Mr. Ben drove from Town A to Town B. For the first 3 hours, he traveled at an average speed of 60 km/h, and after that, he drove at another average speed of 70 km/h. If the distance between Town A and B is 460 km, what was the total time for the whole journey?

Answers

Answer:

First you calculate the distance covered in First 3hrs then calculate the time for the remaining distance then add the total time

which scientist was the first one to use a telescope​

Answers

Answer:

Galileo Galilei developed the first ever telescope

how can iron filings be used to map the magnetic field of a bar magnet?

Answers

putting pieces of irons on a piece of paper,pass the magnet under the paper,and the side which has more iron filling is the north pole and the side which has less iron filling is the south pole.

A bus is running with a velocity of 72 km.hr on seeing a a boy on the road tom a head the driver jammed on the brakes and the bug Stopped witts uniform retradtion 5 m/s2 calculate the distance travelled by bus and discuss whether accident took place or not. ​

Answers

Answer:

Answer is 40m

Explanation:

The explanation is attached in the image below.

The tallest volcano on Mars

A
is three times the height of Mt. Everest.

B
is almost as tall as Mt. Everest.

C
has been visited 44 times.

D
is wet, rocky and cold.

Answers

Answer: Is three times the height of Mt. Everest

Explanation:

Using the process of elimination we can rule out “D” Because its a volcano, C because it says we have visited mars 44 times not the volcano, B because in the passage is literally says “3 times the size of Mt. Everest”.

Answer A is correct

Mars features the tallest volcano in the solar system, which is three times the
height of Mt. Everest and approximately the size of New Mexico. And It's a dry, rocky, cold planet situated
fourth from the Sun. It's called the red planet because of its red hue. Mars has two moons
called Phobos and Deimos.
The tallest volcano on Mars

Match the words in the left-hand column to the appropriate blank in the sentences in the right-hand column. Use each word only once.
1. Nuclear fusion of hydrogen into helium occurs in the_______ .
2. Energy moves through the Sun's ________ by means of the rising of hot gas and falling of cooler gas.
3. Nearly all the visible light we see from the Sun is emitted from the_______ .
4. Most of the Sun's ultraviolet light is emitted from the narrow layer called the _______where temperature increases with altitude.
5. We can see the Sun's _______ most easily during total solar eclipses.
6. The _______ is the layer of the Sun between its core and convection zone.

Answers

The answer to the question are bulleted below

CoreConvection ZonePhotosphereChromosphereCoronaRadiation Zone

1. Nuclear fusion of hydrogen into helium occurs in the core.

2. Energy moves through the Sun's Convection Zone by means of the rising of hot gas and falling of cooler gas.

3. Nearly all the visible light we see from the Sun is emitted from the Photosphere.

4. Most of the Sun's ultraviolet light is emitted from the narrow layer called the Chromosphere where temperature increases with altitude.

5. We can see the Sun's Corona most easily during total solar eclipses.

6. The Radiation Zone is the layer of the Sun between its core and convection zone.

see more here  https://brainly.com/question/18767319

Given the following velocity time graph of 7kg object what is the impulse during segment c (from35 to 55 seconds)

Answers

Answer:

9,11 N.s.,.................

essay on topic of community forest​

Answers

Answer: https://www.fs.usda.gov/managing-land/urban-forests/ucf

Explanation:

if you go to this link it will give you some facts

a boy steps off the end of a high diving board and drops into the water below. it takes the boy 0.78 seconds to reach the water. How high was the diving board?

Answers

Answer:

7.644 feet

Explanation:

Free fall means that an object is falling freely with no forces acting upon it except gravity, a defined constant, g = -9.8 m/s2. The distance the object falls, or height, h, is 1/2 gravity x the square of the time falling.

please someone should help me and solve this is under Hooke's law ​

Answers

[tex]F=k(l_1-l_2)[/tex]

[tex]10=5k[/tex]

[tex]k=2[/tex]

[tex]15=2*(30-l_2)[/tex]

[tex]15=60-2l_2[/tex]

[tex]2l_2=45[/tex]

[tex]l_2=22,5cm[/tex]

10. A flower pot falls off the balcony 10 m above the street. How long does it take to hit the
ground?

Answers

it will take 4.2s for the flower pot to hit the ground!
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