A sinusoidal electromagnetic wave of frequency 6.10×1014hz travels in vacuum in the +x direction. the magnetic field is parallel
1 answer:
Part a) The relationship between the electric field and the magnetic field of an electromagnetic wave is
where
E is the intensity of the electric field
B is the intensity of the magnetic field
c is the speed of light
Using the formula, we find:
part b) it is not specified in the text what is the verse of the magnetic field on the y-axis: I assume its direction is y+.
We can find the direction of the electric field by using the right-hand rule, where:
- the index finger gives the direction of E
- the middle finger gives the direction of B
- the thumb gives the direction of propagation of the wave
since the direction of propagation is x+, and the direction of the magnetic field is y+, we can see that the direction of the electric field (index finger) is z-.
where
E is the intensity of the electric field
B is the intensity of the magnetic field
c is the speed of light
Using the formula, we find:
part b) it is not specified in the text what is the verse of the magnetic field on the y-axis: I assume its direction is y+.
We can find the direction of the electric field by using the right-hand rule, where:
- the index finger gives the direction of E
- the middle finger gives the direction of B
- the thumb gives the direction of propagation of the wave
since the direction of propagation is x+, and the direction of the magnetic field is y+, we can see that the direction of the electric field (index finger) is z-.
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Explanation:
The centripetal acceleration is given by:
Here v is the linear speed and r is the radius of the circular motion. v is defined as the distance traveled to make one revolution () divided into the time takes to make one revolution, that is, the period (T).
Replacing (2) in (1) and replacing the given values:
Answer: Dalton’s model
Explanation:
In the attached image we can see four atomic models labeled with four letters:
W represents the current and accepeted atomic model: a nucleus with an electron cloud, where the orbit and position of the electrons around the nucleus is defined by specific regions (associated with specific energy levels) where there is a greater probability of finding the electron at any given moment. It is important to note this model was improved by the works in quantum physics done by Louis de Broglie and Erwin Schrodinger.
X represents Rutherford's model (This model was proposed after Thomson's model). Ernest Rutherford conducted a series of experiments in order to corroborate Thomson's atomic model. However the results of the experiment led him to find out there is a concentration of charge in the atom's core (which was later called nucleus) surrounded by electrons. This lead to a new atomic model, in which the atom has a positive charged nucleus surrounded by negative charged particles that move similar to the orbit of the planet around the Sun.
Y represents Thomson's model, also called the <em>plum pudding</em> model. This scientific found out that atoms contain small subatomic particles with a negative charge (later called electrons). However, taking into consideration that at that time there was still no evidence of the atom nucleus, Thomson thought the electrons were immersed in the atom of positive charge that counteracted the negative charge of the electrons. Just like the raisins embedded in a pudding or bread.
Z represents Bohr's model. This model was proposed by the danish physicist Niels Bohr after Rutherford's model. In fact, this model was Rutherford's model with the following addition: electrons orbit the nucleus (like planets around the sun) in specific orbits at different energy levels around the nucleus.
So, the only missing model is <u>Dalton's model</u>, which was the first atomic model: the atom represented as a solid, indestructible and indivisible mass. An idea that was already accepted by that time since the ancient Greeks.
