Physics Questions and Answers

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 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 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.

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.

Sound waves are mechanical waves that are longitudinal. This means that the particles of the medium through which sound waves travel, such as air or water, move back and forth in the same direction as the wave travels.