CSDS 103 Exam #! practice test - part 4

Suppose the fundamental frequency of a complex periodic wave is 400 Hz. What would be the frequency of the second harmonic?

Suppose the fundamental frequency of a complex periodic wave is 400 Hz. What would be the frequency of the third harmonic?

Suppose the fundamental frequency of a complex periodic wave is 400 Hz. What would be the frequency of the fourth harmonic?

Suppose the fundamental frequency of a complex periodic wave is 400 Hz. What would be the frequency of the fifth harmonic?

The inverse square law states that as the distance from a sound doubles the intensity decreases by 8dB

The intensity of a teacher’s voice is 75dB at a distance of three feet away from the child. If the child is moved to be six feet away from the teacher, what is the intensity level of the teacher's voice?

The intensity of a teacher’s voice is 75dB at a distance of three feet away from the child. If the child is moved to be twelve feet away from the teacher, what is the intensity level of the teacher's voice?

The intensity of a teacher’s voice is 75dB at a distance of three feet away from the child. If the child is moved to be twenty four feet away from the teacher, what is the intensity level of the teacher's voice?

The difference in decibels between a signal and a noise present at the same time is the ____________

A teacher is speaking at a volume of 50dB and at the same time a fan is blowing in the classroom at 30dB. What is the signal to noise ratio?