Answer:
Option (E) 38 ohm
Explanation:
Voltage, V = 4.5 V
Current, i = 0.12 A
Let r be the resistance of the filament of the bulb.
By use of Ohm's law
V = i x R
4.5 = 0.12 x R
R = 4.5 / 0.12 = 37.5 Ohm
By rounding off
R = 38 ohm
Speed= (frequency) x (wavelength)
= (2 per second) x (5 cm) = <em><u>10 cm/sec .</u></em>
As the number of significant figures increases, the more accurate or precise the measurement is.
<h3>What is significant figure?</h3>
The term significant figures refers to the number of important single digits in the coefficient of an expression in scientific notation.
Significant figures are the digits in a value that are known with some degree of confidence.
The effect of reporting more or fewer figures or digits than are significant;
As the number of significant figures increases, the more accurate or precise the measurement is.
As precision of a measurement increases, so does the number of significant figures.
Learn more about significant figures here: brainly.com/question/24491627
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Answer:
Explanation:
The change in potential energy can be expressed as:
where K is a constant with a value of 
, q1 and q2 are the charges of the proton and the electron and r is the distance between them.
The charge for the proton is 
and the charge for the electron is 
.
Converting r=1.0nm to m:
Replacing values:
