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Serggg [28]
3 years ago
8

Which observation provided Albert Einstein the clue that he needed to explain the photoelectric effect

History
2 answers:
Dafna1 [17]3 years ago
8 0

Answer:

Energy of electrons depends on light's frequency, not intensity.

Explanation:

The photoelectric effect was discovered by physicist Henrich Hertz. Albert Einstein, in 1905, modernized the concepts of this effect when he realized that the energy of electrons depends on the frequency of light, not on intensity.

The discovery of this effect occurred between 1886 and 1887 by Henrich Hertz, who used classical physics to explain it. The classical concepts made the conception of this phenomenon insufficient, giving way to the modern concepts proposed by Albert Einstein in 1905.  Among Einstein's proposals are the quantization of energy, that is, for the occurrence of immediate electron ejection from the surface, the radiation energy (electromagnetic waves) would be concentrated in packages (photons) and not distributed over the wave (classical prediction). It also demonstrated that the speed at which electrons are ejected does not depend on the amount of photons emitted, but on the frequency of these photons.

Montano1993 [528]3 years ago
6 0
<span>Energy of electrons depends on light's frequency, not intensity.</span>
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Sumerian cities were protected by
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Answer:

They built walls around their cities for protection

Explanation:

Sargon the Great

Around 2,300 BC, the independent city-states of Sumer were conquered by a man called Sargon the Great of Akkad, who had once ruled the city-state of Kish. Sargon was an Akkadian, a Semitic group of desert nomads who eventually settled in Mesopotamia just north of Sumer.

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Presidents can avoid congressional oversight of the exercise of the foreign policy powers by entering into arrangements with for
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3 years ago
What is the purpose of the calendars used by the House?
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It is the second one, to help the members organize and complete work
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Which continent is the least densely populated?
murzikaleks [220]

1. Australia

Currently, Australia only has around 3 people per kilometer square which make it the second least densely populated continent in the world. (The first one is Antarctica)

Largest portion of Australian land was left as an authentic wild life environment, which is considered to be the most appealing things to promote Australian tourism sector.

2. higher birth rates

Population would be considered as 'growing' if the amount of birthrates outnumbered the amount of mortality rate each years.

As Africa's economy grow, there would be more people that able to sustain the life of their families. This would lead to an increase in birthrates and number of people who managed to survive and grow into adulthood.

3. By 2100, Africa’s population will reach the level of Asia’s population in 2010.

Even though Africa populations shows a positive growth over the past decades, Asian countries already achieved their industrialized status way before African population. Which means that it is very unlikely the African population would surpass Asian population.

4. Refugees

Refugees mostly decided to move out to other country to seek protection because their life is somehow threatened in their home country.

This would most likely caused by things such as economic instability, cruel government regime, ongoing conflict between different groups, etc.

It is not uncommon for refugees to be seen as nuisance by the people from their country destination due to the different in background, cultures and  language.

5. -lack of educational opportunities

-discrimination

-low standard of living

Push factor refers to the negative characteristic that felt by people in a certain area, which influenced them to move out. This could include wide variety of reasons, including things such as poor economic condition, dangerous conflicts, lack of job and educational opportunities, etc.

6. safety and security

Pull factor refers to a positive characteristic that a certain area has that make it desirable for people outside the area to move in. Political pull factors refers to the pull factors that is controlled by the government. From the options, only safety and security fit the criteria since the government could utilize it's police department or military to achieve it.

6 0
2 years ago
In the online article, "Run Out on the Rails", the author states that whites ignored Chinese workers as long as: Question 4 opti
Nina [5.8K]

the Chinese workers were content/happy performing the jobs few white men wanted

Explanation:

  • As the author of the text says "As long as Chinese were content with jobs few white men wanted, then the whites  ignored them. But as soon as Chinese landed better jobs or ventured into more attractive  industries then trouble brewed, especially during hard economic times. Whites feared  employers would use the Chinese to drive down wages and reduce whites to a status no  higher than that of the Chinese workers themselves."
  • Otherwise, whites were sometimes actually doing some awful things to Chinese workers.
8 0
2 years ago
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