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Chemistry

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Mortimer Welch

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Cards in this guide (10)
India is the Best

Yes it is. India is best in everything. If we have a glance on the history

Indians were the first to discover zero (0)

Indians made Iron pillar which is near about 1600 years old and is made of pure iron and is yet not rusted.

India is the motherland of many gods.

Though India is suffering from some troubles but it is still the best of all.

How are radioactive isotopes detected

They emit radiation as they decay.

That radiation is not generally detectable by human senses (unless it glows in a color range we can see).

We need lab instruments to detect the radiation such as:

  1. Geiger Counter, with Geiger-Mueller (GM) Tube or Probe-A GM tube is a gas-filled device that, when a high voltage is applied, creates an electrical pulse when radiation interacts with the wall or gas in the tube. These pulses are converted to a reading on the instrument meter.
  2. MicroR Meter, with Sodium Iodide Detector-A solid crystal of sodium iodide creates a pulse of light when radiation interacts with it. This pulse of light is converted to an electrical signal by a photomultiplier tube (PMT), which gives a reading on the instrument meter.
  3. Ionization (Ion) Chamber-This is an air-filled chamber with an electrically conductive inner wall and central anode and a relatively low applied voltage. When primary ion pairs are formed in the air volume, from x-ray or gamma radiation interactions in the chamber wall, the central anode collects the electrons and a small current is generated. This in turn is measured by an electrometer circuit and displayed digitally or on an analog meter.
  4. Neutron REM Meter, with Proportional Counter-A boron trifluoride or helium-3 proportional counter tube is a gas-filled device that, when a high voltage is applied, creates an electrical pulse when a neutron radiation interacts with the gas in the tube. The absorption of a neutron in the nucleus of boron-10 or helium-3 causes the prompt emission of a helium-4 nucleus or proton respectively. These charged particles can then cause ionization in the gas, which is collected as an electrical pulse, similar to the GM tube.
Adaptations give organisms a better chance for

survival

What played a part in US economic growth in the 1950s

U.S. factory production catalyzed by WWII played a part in US economic growth in the 1950s.

A third-generation American can be best described as someone

A third-generation American can best be described as someone whose grandparents came from another country.

What does the law of conservation of matter show

That the total number of atoms in matter will never change

Answer2:

As I learned it:

Matter can neither be created nor destroyed, only changed in form.

This is/was Newtonian physics. Einstein showed that in nuclear events matter can be changed to energy. And, in general relativity even more complex change can occur.

What property is it when a potassium perchlorate decomposes to potassium chlorate and oxygen gas

Since decomposition is a chemical reaction, it would be considered a chemical property.

Which of the following is not a sustainable form or energy production

Coal

What is Rutherford and Marsdens nuclear model

The Rutherford atomic model contain a central, positive, concentrated mass called atomic nucleus; around the nucleus are moving electrons.

Trickle down economics was an economic policy supported by

Trickle down economics was an economic policy supported by Ronald Reagan.

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