Oscilloscope Works Great
Help Please! Physics - Frequency exercises that i need help with...?
A) What are the frequency and amplitude of the oscilloscope signal (sine wave) if the y-input knob on the 0.2mV/div scale and the time/div knob was on the .2msec/div scale?
B) what should be the distance between anti-nodes of a standing wave of sound of frequency 9kHz, if the room temp is 24 degrees Celsius?
C) If a sound pulse travels a distance of 36cm in a time of 1.06ms, what is its speed?
D) If signals at 310Hz and 330Hz are combined:
1. What should be the beat frequency?
2. What should be the frequency of the carrier wave?
If you could help me solve some or all of these that would be much appreciated. I just don't understand what to do here. If it would be possible to give the answers with the work and explanations that would be great. Thank You!
A) You need to read off of the display how many divisions the peak of the
sine wave encompasses. And for the frequency, you must first read off
from the display how many divisions encompasses one period of the wave.
Only then, will you be able to determine the amplitude as:
A = #divisions*0.2 mV/div
While the period of the wave will be: T = #divisions*0.2 ms/div
and finally the frequency: f = 1/T
B) ½ λ,
wavelength: λ = v/f = 331/9x10³ = 3.67x10-² m = 3.67 cm
½ λ = 0.5*3.67 = 1.835 m
C) v = 0.36/1.06 = 0.34 m/s
D) 330-310 = 20 Hz
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