True or False. The Magnitude of the induced voltage in a coil of wire depends on how quickly the magnetic flux through the coil
2 answers:
You might be interested in
Answer:
A. Shorter in wavelength and higher in energy
Explanation:
The peak wavelength of a star can be found by using Wien's displacement law:
where
b is the Wien's displacement constant
T is the surface temperature of the star
From the equation, we see that the peak wavelength is inversely proportional to the temperature: therefore, a star which is hotter then the sun (greater T) will have shorter wavelength.
Moreover, the energy of the emitted radiation is inversely proportional to the wavelength:
where h is the Planck constant, c is the speed of light. Therefore, shorter wavelength means higher energy.
So, the correct answer is
A. Shorter in wavelength and higher in energy
Answer:
7.90 N/C
Explanation:
<u>Given:</u>
= initial velocity of the electron =
= final velocity of the electron = 0 m/s
= distance traveled by the electron before coming to rest = 9 cm = 0.09 m
<u>Assume:</u>
= charge on an electron =
= mass of an electron =
= electric field along the direction of motion
= electric force on the electron
= work done by the electric force
Since the electron is moving in the direction of the electric field, then the electric force on it will act in the direction opposite to its displacement whose magnitude is given by:
Since the displacement of the electron opposite to the direction of electron, the work done by electric force will be given by:
Since the electron enters the region of the uniform electric field with an initial speed u and travels a distance x to come to rest. The change in kinetic energy of the electron can be given by:
Since only the electric force is doing work on the electron, then the change in kinetic energy will be equal to the work done by electric force. This is due to the work-energy theorem.
Hence, the magnitude of electric field is given 7.90 N/C which point in the direction of the displacement of the electron.