Which statement best describes resistance? Resistance is
2 answers:
Answer:
How well a material conducts an electrical charge and is measured in ohms.
Explanation:
Resistance is the property of a conductor which opposes the flow of electric current. Its SI unit is ohms and represented by . According to Ohm's law voltage is directly proportional to the current flowing through the circuit.
It depends directly on the length of the conductor and inversely on its area of cross section. It measure how well a material conducts an electrical charge. Hence, the correct option is (b).
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Answer:
Explanation:
Given that,
The radius of a flywheel, r = 0.3 m
Angular acceleration of a flywheel,
We need to find the magnitude of the tangential acceleration after 2.00 s of acceleration.
The relation between the tangential and angular acceleration is given by :
So, the required magnitude of tangential acceleration is .
Answer:
Red photons have the least amount of energy
Explanation:
The relationship between the photon energy and the color of light is given by:
where
E is the energy
h is the Planck constant
c is the speed of light
is the wavelength (which determines the color of light)
As we see from the equation, energy and wavelength are inversely proportional: this means that the longer the wavelength, the lower the energy, and viceversa.
Among the colors in the visible light spectrum, red is the color with longest wavelength (620-750 nm) and violet is the color with shortest wavelength (380-450 nm). This means that red photons have the least amount of energy, while violet photons have the greatest amount of energy.
So the correct choice is
Red photons have the least amount of energy