A
B
C
D
Correct answer is B
The diagram above is a full wavelength and the length of an open pipe during first overtone equals one wavelength i.e. l = λ
1.00m
0.75m
0.25m
0.50m
Correct answer is D
Number of cycles, n = \(2\frac{1}{2} = \frac{5}{2}\)
Length = nλ
λ = \(\frac{Length}{n}\) = \(\frac{125}{\frac{5}{2}}\)
Therefore, λ = 50cm = 0.50m.
The electric field in the region outside the parallel plate is zero, except for the edge effects
The magnitude of the electric field strength at any point between the plates, except near the edges, depends on the magnitude of the charge on each plate.
The magnitude of the electric field strength at any point between the plates is directly proportional to the magnitude of the charge on each plate.
The electric field is uniform everywhere in the space between the parallel plates
Correct answer is C
The magnitude of the electric field strength at any point between the plates is not directly proportional to the magnitude of the charge on each plate. Instead, it is directly proportional to the charge density (charge per unit area) on the plates. Therefore, if the charge on the plates is increased while keeping the area of the plates constant, the electric field strength will increase. However, if the area of the plates is also increased such that the charge density remains constant, the electric field strength will not change
The shape of the instrument
The tension of the string
The size of the instrument
The material of the instrument
Correct answer is B
The frequency of a sound wave is proportional to the tension of the string. If two instruments have the same frequency, but one has a tighter string, then the instrument with the tighter string will have a higher pitch.
The other factors listed, such as the size of the instrument, the material of the instrument, and the shape of the instrument, will also affect the pitch of the instrument, but they will have a smaller effect than the tension of the string.
In an AC circuit, resonance occurs when the impedance of the circuit is:
Zero
Maximum
Equal to the capacitive reactance of the circuit
Minimum
Correct answer is D
Resonance in an AC circuit occurs when the inductive reactance (XL) is equal to the capacitive reactance (XC). This is because at this point, the two reactances cancel each other out, leaving only the resistance of the circuit. As a result, the impedance of the circuit is minimized.
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