SHS 311 Test 1 Questions and Answers 2024 with Complete Solution
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Course
SHS 311
Institution
SHS 311
SHS 311 Test 1 Questions and Answers 2024 with Complete Solution
How is the length of a string or a tube related to the fundamental frequency of a standing wave? - Answer- The fundamental frequency of a standing wave is inversely related to the length (L) of the string or tube
How can a complex...
SHS 311 Test 1 Questions and
Answers 2024 with Complete
Solution
How is the length of a string or a tube related to the fundamental frequency of a
standing wave? - Answer- The fundamental frequency of a standing wave is inversely
related to the length (L) of the string or tube
How can a complex sound be created using simple sine waves? - Answer- By adding
simple sine waves together
What are the frequency domain amplitude and phase spectrum? - Answer- Time
domain: time pressure, wave form
Frequency domain: amplitude spectrum, phase spectrum
What is plotted in a spectrograph - Answer- Time, frequency, and amplitude
4 types of filters and the characteristics of a filter (cutoff frequencies and roll-off)? Know
the amount of attenuation age a particular frequency - Answer- •low pass filter
attenuates high frequencies
•High pass filter attenuates low frequencies
•band psd filter attenuates low and high frequencies
General relationship between frequency-domain spectra and time-domain waveforms -
Answer- Short time durations result in broad spectrum
While long time durations yield narrow frequency bands (inverse relationship)
What are beatings and amplitude modulation? Know the amplitude modulation
frequency caused by beatings between two sine waves - Answer- Adding together two
sinusoids that are close in frequency creates a beating
Sinusoidal amplitude modulation has three components:
-carrier frequency at Fc
-side and frequency at Fc-Fm
-sideband frequency at Fc+Fm
•absolute value (F1-F2) the difference between the two frequencies
Harmonics - Answer- multiples of the fundamental frequency
Same as octaves
, Nth harmonic frequency that is n times the fundamental frequency
3rd harmonics= 3 times 100= 300 Hz
Octave - Answer- A ratio of 2 in frequency
•the number of octaves between frequencies
Octave number times the number of roll off in dB/octave
Ex: cut off frequency=0 dB
1 octave above= 12 dB
2 octaves above= 24 dB
3 octaves above= 36 dB
4 octaves above= 48 dB
What part of the mass-spring model of vibration represents elasticity? - Answer- Spring
What parameter is missing in the following equation of sinusoidal vibration?
d(t)=sin(2ft+θ) - Answer- Amplitude
What is the physical parameter related to the auditory perception in the last question? -
Answer- Frequency
What is the peak amplitude if the peak-to-peak amplitude of a sine wave is 10 mm? -
Answer- 5 mm
How many degrees are there in a quarter of the period of sinusoidal vibration? -
Answer- 90
Which is one aspect of auditory perception? - Answer- Pitch
How does air pressure change when the altitude increases? - Answer- Decreases
What is the relationship between sound intensity I and pressure p? - Answer- I is
proportional to p^2
A condensation peak - Answer- Moves away from a vibrating source
If a sound's Frequency (f) is 3500 Hz, and the Speed of Sound (c) is 350 meters/sec,
what is the sound's Wavelength (λ)? - Answer- 0.1 meter
Decibel (dB) is defined as - Answer- 20log (p/pº)
A person requires 5 times more power than normal to detect a sound. How many dab is
that? [log(5)=0.7] - Answer- 7
What is the power ratio for 3 dB? [0.3=log(2)] - Answer- 2
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