Niels Bohr was a Danish physicist who contributed to the understanding of the atom and quantum mechanics. He was awarded the Nobel Prize in Physics in 1922.
Based on the theories of Ernest Rutherford, he published his own atomic model (Bohr's atomic model) in 1913, introducing the theory of quantized orbits, which in quantum mechanical theory consists of the characteristics that, around the Atomic nucleus, the number of electrons in each orbit increases from the inside to the outside.
In his model, in addition, the electrons could fall (to go from one orbit to another) from an outer orbital to an inner one, emitting a photon of discrete energy, fact on which quantum mechanics is based.
In 1922 he received the Nobel Prize in Physics for his work on atomic structure and radiation.
In a ballistics test, a 1.50-g bullet is fired through a 28.0-kg block traveling horizontally toward the bullet. In this test, the bullet takes 11.4 ms to pass through the block as it reverses the block's velocity from 1.75 m/s to the right to 1.20 m/s to the left with constant acceleration. Find the magnitude of the force that the bullet exerts on the block during this ballistics test.
The decomposition a → b + c of a molecule a obeys the rate-law expression rate = 0.080 min−1 [a]. if the initial concentration of a is 0.30 m, what is the concentration after 2.6 minutes? 1. 0.028 m 2. 0.24 m 3. 0.38 m 4. 0.13 m 5. 0.32 m 0
Which of these models of the solar system first proved that the sun is at the center of the solar system? Ptolemy's geocentric model
Brahe view of the solar system
Kepler view of the solar system
Copernicus' heliocentric model
I think the answer is C-Kepler, because of the word "proved" in the question.
This is why, "Kepler used the meticulous notes and data gathered by Brahe to make discoveries about the motion of the planets. Kepler’s work proved Copernicus’s view that the solar system was heliocentric.".
Can someone confirm my thinking? Hate tricky questions :)
Copernicus' heliocentric model
Nicolaus Copernicus was the first one to give the heliocentric model of the solar system. The heliocentric model of the solar system describes the sun to be at the center of the solar system and earth and other planets with their moons revolving about it in concentric orbits.
Kepler believed in Copernicus's heliocentric model but gave laws of planetary motion that described the orbit of the planets to be elliptical instead of circular.
Tycho Brahe view of the solar system was that sun revolved around earth but other planets revolved around the sun.
Ptolemy's geocentric model considered earth to be the center of the universe and sun and other planets revolving about it.
A car starting from rest covers a displacement of 200m over a time interval of 10 seconds. Find the acceleration of the car
If object A has more mass than object B, does object A contain more matter? Explain why it is so.
A 0.412 kg metal cylinder is placed inside the top of a plastic tube, the lower end of which is sealed off by an adjustable plunger. The cylinder comes to rest some distance above the plunger. The plastic tube has an inner radius of 7.41 mm and is frictionless. Neither the plunger nor the metal cylinder allow any air to flow around them. If the plunger is suddenly pushed upwards, increasing the pressure between the plunger and the metal cylinder by a factor of 2.55 , what is the initial acceleration a of the metal cylinder? Assume the pressure outside of the tube is 1.00 atm .
1 atm = 101325 Pa
r = 7.41 mm = 0.00741m
Since the pressure is increased by a factor of 2.55, the new inner pressure inside the system would be
P = 101325 * 2.55 = 258378.75 Pa
This pressure exerts a force on the metal cylinder, knowing the radius, we can calculate the cross-section area:
Then the force exerted:
Finally we can calculate the initial acceleration in accordance with Newton's 2nd law of motion:
A sudden discharge of static electricity during a thunderstorm is called
The state of matter that keeps its shape and volume when it is placed in different containers
Find the impedance of the load for maximum power transfer in the attached circuit.