Final answer:
The maximum or peak value of the upper sideband voltage (E_um) is found by multiplying the carrier maximum voltage (E_cm) by the modulation index (m). For a modulation index of 30% and a carrier maximum voltage of 70 Volts, the peak upper sideband voltage (E_um) is 21 Volts.
Step-by-step explanation:
To find the maximum or peak value of the upper sideband voltage (E_um), we can use the given carrier maximum voltage (E_cm) and the modulation index (m). The upper sideband voltage (E_um) is calculated as a percentage of the carrier's maximum amplitude. Using the modulation index, which in this case is 30% or 0.3, we get the formula:
E_um = m × E_cm
Substituting the given values, we have:
E_um = 0.3 × 70 Volts = 21 Volts
Therefore, the maximum or peak value of the upper sideband voltage (E_um) is 21 Volts.