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An amplitude modulated signal is plotted below : Which one of the following best describes the above signal ?

1. (1 + 9sin (2 π × 10 4 t)) sin(2.5 π × 10 5 t) V
2. (9 + sin (4 π × 10 4 t)) sin(5 π × 10 5 t) V
3. (9 + sin (2 π × 10 4 t)) sin(2.5 π × 10 5 t) V
4. (9 + sin (2.5 π × 10 4 t)) sin(2 π × 10 4 t) V

Correct answer: (9 + sin (2 π × 10 4 t)) sin(2.5 π × 10 5 t) V

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