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Scientists
This category is for questions about the people who apply the scientific method to solve problems, introduce new concepts, and strive to explain the natural world.
9,527 Questions
1. Discovery of vaccination has led to vaccines which meant that I never had polio, measles, mumps, or rubella.
2. Discovery of pasteurization has made my milk safer to drink.
3. Discovery of the causes of appendicitis led to doctors knowing that removing my appendix would save my life.
4. Discovery that xylitol helps to keep teeth strong has led me to look for brands of gum that include xylitol as an ingredient.
5. Discovery that hernias can be repaired with a patch led to my life being saved again.
6. Discovery that exercise prevents strokes has encouraged me to run more when i otherwise would not have.
7. Discovery of how to remove wisdom teeth led to me being able to avoid messed up teeth by having them removed before they could come in.
8. Discovery that there is no link between cell phones and brain cancer has allowed me to use my cell phone without worry.
9. Discovery that olive oil is healthier for the body than butter has led to me cook with olive oil instead of butter.
10. Discovery of hormones which you can put in pills which regulate menstruation cycles has allowed me to have sex with my girlfriend without a condom and not worry about getting her pregnant.
What scientist discovered that atoms have distinct energy levels?
Niels Bohr discovered that atoms have distinct energy levels in 1913, while working on his model of the hydrogen atom. This discovery laid the foundation for our current understanding of atomic structure and how electrons move within atoms.
Are the compressions found on the same location in the slinky before and after hitting the wall?
No, the compressions found on the slinky will be different before and after hitting the wall. Before hitting the wall, the compressions will be moving towards the wall. After hitting the wall, the compressions will be reflected back towards the source of the disturbance.
What does water vapor needs to turn into droplets?
Water vapor needs to cool down in order to turn into droplets. This cooling process can happen by either coming into contact with a colder surface or by the surrounding air temperature dropping. Once the water vapor cools sufficiently, it will condense into droplets.
Why was it so difficult for scientists to understand the atom?
Scientists found it difficult to understand atoms because they are extremely small, much smaller than what can be seen with the naked eye. Additionally, atoms are constantly in motion, making them difficult to observe and study. The discovery of subatomic particles like electrons, protons, and neutrons added to the complexity of understanding the structure of atoms.
Why do scientists use a balance?
Scientists use a balance to measure the mass of an object accurately. By using a balance, they can compare the weight of an object to a known standard weight, allowing for precise measurements in scientific experiments.
How do scientist use density in their field?
Scientists use density in various fields such as chemistry, physics, geology, and environmental science to characterize substances, identify materials, and understand processes. By measuring the density of a substance, scientists can determine its purity, composition, and state (e.g., solid, liquid, gas), leading to insights into its properties and behavior. Density calculations also play a critical role in designing experiments, developing materials, and predicting how substances will interact in different conditions.
What scientist study elements?
Chemists, specifically those in the field of analytical chemistry or physical chemistry, study elements and their properties. They work to understand the composition, structure, and behavior of elements in various compounds and environments.
How have scientists been able to determine the compostition?
Scientists determine the composition of materials by using techniques such as spectroscopy, mass spectrometry, and chemical analysis. These methods involve studying the interaction of matter with electromagnetic radiation and separating compounds based on their mass and charge. By analyzing the results, scientists can identify the elements present in the material and their relative quantities.
What was the main reason most scientist did not accept continental drift?
It is because he couldn't explain why or how the continent's drifted apart. They didn't believe him until after he died.
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More to the point, they didn't believe him until new techniques showed hitherto-hidden evidence.
How is sodium lamp different from normal lamp?
A sodium lamp produces light by passing an electrical current through sodium vapor, emitting a yellowish-orange light. On the other hand, a typical lamp, such as an incandescent or LED lamp, produces light through the conversion of electrical energy into visible light using different mechanisms like heating a filament or stimulating electrons in a semiconductor material. Sodium lamps are more energy-efficient but have limited color rendering compared to traditional lamps.
The model used to describe the behavior of very small particles like electrons orbiting an atom is the quantum mechanical model. This model incorporates principles of quantum mechanics to describe the probability of finding an electron at different locations around the nucleus of an atom.
Can scientists cool matter to absolute zero?
No, reaching absolute zero (0 Kelvin) is theoretically impossible because it would require a complete absence of thermal energy. Scientists can get very close to absolute zero using various methods, such as laser cooling and magnetic cooling, but they cannot achieve absolute zero.
What have scientists learn from clam fossils?
Scientists have learned about the evolutionary history and biodiversity of clams, including the different species that have existed over time and how they have adapted to changing environments. By studying clam fossils, scientists can also determine the age of rock formations and understand past climates and ecosystems. Fossils provide valuable information about ancient life on Earth and help us piece together the history of our planet.
What one thing scientist do to make sure their measurements are presice and accurate?
Scientists ensure the precision and accuracy of their measurements by calibrating their instruments regularly, taking multiple measurements to account for variability, and using control groups or standards for comparison. Additionally, they may employ statistical analysis to identify and correct for any errors or uncertainties in their data.
Periodic table help scientist discover what?
The periodic table helps scientists discover the relationships between different elements, their properties, and their behavior in chemical reactions. It provides a structured way to organize and understand the fundamental building blocks of matter, which has led to the development of new materials, technologies, and advancements in various scientific fields.
HOW DOES A scientist helps a colleague do a better experiment by?
A scientist can help a colleague do a better experiment by offering guidance on experimental design, providing feedback on methodology, and suggesting ways to improve data analysis and interpretation. Additionally, they can share their expertise and experience to troubleshoot any issues that may arise during the experiment.
What two ways of thinking helped scientists to disprove the idea of supernatural forces?
The development of the scientific method, which relies on empirical evidence and experimentation, helped scientists disprove the idea of supernatural forces by providing a systematic approach to understanding the natural world. Additionally, the principle of Occam's razor, which states that the simplest explanation is often the best, encouraged scientists to seek natural explanations for phenomena rather than resorting to supernatural ones.
What do scientists use a ruler?
Scientists use a ruler to measure the length or size of objects in their experiments or studies. Rulers provide a standardized unit of measurement, allowing scientists to collect and compare data accurately.
What changes happened at the result of Robert bunsens work?
As a result of Robert Bunsen's work, he developed the Bunsen burner, which revolutionized laboratory experiments by providing a controllable heat source. This invention made it easier for scientists to perform various chemical reactions and experiments, leading to advancements in chemistry and other scientific fields.
How can a scientist improve the accuracy of the experiment?
A scientist can improve the accuracy of an experiment by carefully designing the study, ensuring precise measurement techniques, reducing errors through proper controls, replicating the experiment to check results consistency, and analyzing data rigorously to draw reliable conclusions.
A list of alive atomic scientists?
Greek
era Democritus "by convention bitter, by convention sweet, but in reality atoms and void" 1704 Isaac Newton Proposed a mechanical universe with small solid masses in motion. 1803 John Dalton Proposed an "atomic theory" with spherical solid atoms based upon measurable properties of mass. 1832 Michael Faraday Studied the effect of electricity on solutions, coined term "electrolysis" as a splitting of molecules with electricity, developed laws of electrolysis. Faraday himself was not a proponent of atomism. 1859 J. Plucker Built one of the first gas discharge tubes ("cathode ray tube"). 1869 Dmitri MendeleevArranged elements into 7 groups with similar properties. He discovered that the properties of elements "were periodic functions of the their atomic weights". This became known as the Periodic Law. 1873 James Clerk MaxwellProposed electric and magnetic fields filled the void. 1879 Sir William Crookes Discovered cathode rays had the following properties: travel in straight lines from the cathode; cause glass to fluoresce; impart a negative charge to objects they strike; are deflected by electric fields and magnets to suggest a negative charge; cause pinwheels in their path to spin indicating they have mass. 1886 E. Goldstein Used a CRT to study "canal rays" which had electrical and magnetic properties opposite of an electron. 1894 G.J. Stoney Proposed that electricity was made of discrete negative particles he called electrons ". (Link to info on electrons) 1895 Wilhelm Roentgen Using a CRT he observed that nearby chemicals glowed. Further experiments found very penetrating rays coming from the CRT that were not deflected by a magnetic field. He named them "X-rays". 1896 Henri Becquerel While studying the effect of x-rays on photographic film, he discovered some chemicals spontaneously decompose and give off very pentrating rays. 1897 J.J. Thomson Used a CRT to experimentally determine the charge to mass ratio (e/m) of an electron =1.759 x 10 8 coulombs/gram. 1897 J.J. Thomson Studied "canal rays" and found they were associated with the proton H + . 1898 Rutherford Studied radiations emitted from uranium and thorium and named them alpha and beta. 1898 Marie Sklodowska Curie Studied uranium and thorium and called their spontaneous decay process "radioactivity". She and her husband Pierre also discovered the radioactive elements polonium and radium. 1900 Soddy Observed spontaneous disintegration of radioactive elements into variants he called "isotopes" or totally new elements, discovered "half-life", made initial calculations on energy released during decay. 1900 Max Planck used the idea of quanta (discrete units of energy) to explain hot glowing matter. 1903 Nagaoka Postulated a "Saturnian" model of the atom with flat rings of electrons revolving around a positively charged particle. 1904 Abegg
Discovered that inert gases had a stable electron configuration which lead to their chemical inactivity.
1905 Albert Einstein Published the famous equation E=mc 2 1906 Hans Geiger Developed an electrical device to "click" when hit with alpha particles. 1909 R.A. Millikan Oil drop experiment determined the charge (e=1.602 x 10 -19 coulomb) and the mass (m = 9.11 x 10 -28 gram) of an electron. 1911 Ernest Rutherford Using alpha particles as atomic bullets, probed the atoms in a piece of thin (0.00006 cm)gold foil . He established that the nucleus was: very dense,very small and positively charged. He also assumed that the electrons were located outside the nucleus. 1914 H.G.J. Moseley Using x-ray tubes, determined the charges on the nuclei of most atoms. He wrote"The atomic number of an element is equal to the number of protons in the nucleus". This work was used to reorganize the periodic table based upon atomic number instead of atomic mass. 1919 Aston Discovered the existence of isotopes through the use of a mass spectrograph. 1922 Niels Bohr Developed an explanation of atomic structure that underlies regularities of the periodic table of elements. His atomic model had atoms built up of sucessive orbital shells of electrons. 1923 de Broglie Discovered that electrons had a dual nature-similar to both particles and waves. Particle/wave duality. Supported Einstein. 1927 Heisenberg Described atoms by means of formula connected to the frequencies of spectral lines. Proposed Principle of Indeterminancy - you can not know both the position and velocity of a particle. 1929 Cockcroft / Walton Built an early linear accelerator and bombarded lithium with protons to produce alpha particles 1930 SchrodingerViewed electrons as continuous clouds and introduced "wave mechanics" as a mathematical model of the atom. 1930 Paul Dirac Proposed anti-particles . Anderson discovered the anti-electron (positron) in 1932 and Segre/Chamberlain detected the anti-proton in 1955.. 1932 James Chadwick Using alpha particles discovered a neutral atomic particle with a mass close to a proton. Thus was discovered the neutron. 1938 Lise Meitner,Hahn , Strassman Conducted experiments verifying that heavy elements capture neutrons and form unstable products which undergo fission. This process ejects more neutrons continuing the fission chain reaction. 1941 - 51 Glenn Seaborg Synthesized 6 transuranium elements and suggested a change in the layout of the periodic table. 1942 Enrico Fermi Conducted the first controlled chain reaction releasing energy from the atoms nucleus. 1950's - New findings/particles Follow this link to current theories about atomic stucture.
Hope it help's youWho was the Russian scientist who discovered a set of patterns that apply to all elements?
Dmitri Mendeleev was the Russian scientist who discovered the periodic law and created the first version of the periodic table in 1869. He arranged the known elements by their atomic mass, demonstrating a periodic arrangement of properties that revealed recurring patterns.
The first experiments in accoustics were conducted by the philosopher and scientists?
The first experiments in acoustics were conducted by the philosopher and scientist Pythagoras in ancient Greece. He discovered the mathematical relationship between the length of a vibrating string and the pitch of the sound it produced, known as the harmonic series. This laid the foundation for our understanding of sound and music.
