Answer: a)
Explanation: The phenomenon of emission is related to electronic transitions with the atom so brightly emission lines can represent the most important electronics transitions. They cover the whole spectrum from UV to IR.
Answer:
Positive y-axis
Explanation:
First of all, we need to find the direction of the magnetic force.
We know that the direction of the magnetic force on a charged moving particles is perpendicular to both the velocity of the particle and the direction of the magnetic field. For a positive charged particle, we can use the right-hand rule. In this case, we find:
- index finger: direction of the velocity of the particle (positive x-axis)
- middle finger: direction of the magnetic field (positive z-axis)
- thumb: direction of the magnetic force (in this case, negative y-axis)
Therefore, the direction of the magnetic force is in the negative y-axis.
In order for the particle to not change its velocity (so, being undeflected), the electric force must balance the magnetic force: therefore, the electric force must be in the opposite direction as the magnetic force, so in the
positive y-axis
direction.
We also know that for a positively charged particle ,the direction of the electric force is the same as the electric field: therefore, the direction of the electric field is also along the positive y-axis.
The one word you're looking for to fill in the blank
can be "uneven" or "non-uniform".
High task repitition, forceful exertions, repetitive or sustained awkward posture
Answer:
D. Frequency
Explanation:
The energy of an electromagnetic wave is proportional to frequency, mathematically it is expressed as;
E ∝ f
E = hf
where;
h is Planck's constant = 6.626 x 10⁻³⁴ Js
The equation above can also be expanded to;
where;
c is speed of light = 3 x 10⁸ m/s
λ is the wavelength of the electromagnetic wave
Since the speed of light is constant, we can conclude that the energy of the electromagnetic wave is directly proportional to its frequency and inversely proportional to its wavelength.
Therefore, the correct option for direct proportionality is FREQUENCY