1. Select the best answer regarding your observation a. both s(t) and b(t) appea

Question

1.

Select the best answer regarding your observation

a. both s(t) and b(t) appear as identical sine waves

b. both s(t) and b(t) appear as identical cosine waves

c. s(t) appears as a sine wave while b(t) appears as a cosine wave

d. s(t) appears as a cosine wave while b(t) appears as a sine wave

2.

What are the differences between the two plots a(t) and b(t)

a. a(t) and b(t) have the same amplitudes

b. a(t) has a higher frequency than b(t)

c. a(t) and b(t) appear as identical plots

d. For every single cycle for a(t), two cycles of b(t) are seen

3.

Select the correct observation for a(t) and b(t)

a. plots are same in amplitude

b. plots are same in frequency

c. since a(t) and b(t) phase angles are 0, a(t) appears as a sinewave that “lags” b(t), which is a cosine wave

d. both b and c are correct

4.

Having changed the message amplitude to Am=50, select the correct statement

a. The signal, s(t), still behaves as an AM modulated signal, and therefore will faithfully represent the original message wave

b. Very minimal changes in the signal, s(t), can be seen; however, it is difficult to clearly identify changes, which means that distortion is being experienced by our modulated carrier wave

c. Since only the amplitude of the message wave has increased, there is no negative impact to the modulated carrier signal

d. None of the above are correct

5.

Select the correct statement that describes what you see in the plots:

a. The signal, s(t), is distorted by the dramatic change in message frequency.

b. The message amplitude change can be seen in the signal plot of s(t). When comparing plots for s(t) and m(t), it is obvious that the signal accurately represents the message.

c. Both the message and carrier frequencies increase, therefore distortion will be experienced.

d. The phase of the signal has shifted to the right, because AM techniques impact phase and amplitude.

a. both s(t) and b(t) appear as identical sine waves

b. both s(t) and b(t) appear as identical cosine waves

c. s(t) appears as a sine wave while b(t) appears as a cosine wave

d. s(t) appears as a cosine wave while b(t) appears as a sine wave

Figure 1 File Edit View Insert Tools Desktop Window Help Sine and Cosine Waveforms -1 -2 .2 -3 -3 0.005 -5 0.01 0.005 0.01

Explanation / Answer

If you post more than 1 question, as per chegg guidelines I have to solve only first question.

Ques 1. Answer : (c)  s(t) appears as a sine wave while b(t) appears as a cosine wave

The sine wave passes through the origin an has the value of 0 at origin.So, is the case in s(t)

The cosine wave has the maximum value at origin as in the case of b(t).

It is because

sin(0) = 0

cos(0) = 1

Other than that, there is not much difference between s(t) and b(t).

Ques 2. Answer : (d) For every single cycle for a(t), two cycles of b(t) are seen

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