Answer:
The velocity of sound is greatest in option a water option be here option c vacancy option d metals.
Explanation:
<span>For this particular problem, we use Ohm's Law. This law deals with the relation between
voltage and current in an ideal conductor. It states that: Potential difference
across a conductor is proportional to the current that pass through it. It is
expressed as V=IR. Using the equation, we can isolate I or the current to one side and the other terms to the other side. We calculate as follows:
V = IR
I = V/R
I = 12 V / 20 </span><span>Ω
I = 0.6 amperes
Therefore, the current that is flowing through the wire supplied with 12 V and having a resistance of 20 </span><span>Ω would be 0.6 amperes.</span>
B, smallest speed or either C, greatest acceleration? Explain
Answer:
Experiments showed that increasing the light frequency increased the kinetic energy of the photoelectrons, and increasing the light amplitude increased the current.
Explanation:
The photocurrent increases linearly with the intensity of the incident light but is independent of its frequency. The stopping potential increases linearly with the frequency of the incident light but is independent of its intensity.
Two lenses that should be purchased are lenses with the power of 1d and 4d or 2d and 3d.
We need to know about the power of the lens to solve this problem. Lens power can be defined as the ability of the optical device to see. It can be represented by a dioptre unit. The relaxed power formula is
P = 1 / f
where P is the power of the lens in dioptre, and f is the focal length.
From the question above, the given parameter is
f = 0.2 m
By substituting the given parameters, we can calculate the power of the lens
P = 1 / f
P = 1 / 0.2
P = 5d
The total diopter should be 5d.
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