The greater the amplitude of a wave, the greater its
1 answer:
The greater the amplitude of a wave, the greater its D) energy
Explanation:
- The amplitude of a wave is the maximum displacement of the wave with respect to the equilibrium position. It is generally indicated with A.
The energy of a wave is proportional to the square of its amplitude:
Therefore, we immediately see that option D) is the correct one: the greater amplitude of the wave, the greater its energy.
The other quantities of a wave are:
- Frequency: it is the number of complete cycles of the wave per second
- Wavelength: it is the distance between two crests of the wave
- Speed: the speed of a wave is calculated using the equation
where f is the frequency and is the wavelength.
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The field lines spread apart as we move away from the charge, and they point away from the charge
Explanation:
The electric field produced by a single-point positive charge is a radial field, whose strength is given by the equation
where
k is the Coulomb's constant
Q is the magnitude of the charge
r is the distance from the charge at which the field is calculated
There are two pieces of information given by the field lines shown in the graph:
- The spacing between the lines gives an indication of the strength of the field: the closer to each other they are, the stronger the field. In this case, as we move away from the charge, the spacing between the lines increases, and this means that the field becomes weaker (in fact, it follows an inverse square law,
- The direction of the lines gives the direction of the electric field, which points away from the central charge. This is because the direction of the electric field corresponds to the direction of the force that a positive test charge would feel when immersed in the electric field: in this case, if we place a positive test charge in this field, then it would get repelled away from the central charge (remember that the electric force between two positive charges is repulsive), and therefore, the direction of the electric field is away from the central charge.
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