Physic for sound and music This is test A. Put A for the first answer The pinna
ID: 1546720 • Letter: P
Question
Physic for sound and music
This is test A. Put A for the first answer The pinna is more useful for locating sources of _________ frequency sound (think diffraction). A. high B. low A pressure difference between the inner ear and the outer ear (e.g., due to altitude changes) _____ the amount e of vibrations reaching the inner ear. A. Increases B. Decreases C. Does not change If you have a JND in frequency of 2 Hz in the region around 2000 Hz, roughly how many different "notes" can a person hear in the frequencies between 2000 and 2100 Hz? A. 50 B. 100 C, 200 D. 400 You want to produce a sound which will be perceived as 0.2 sones. How many more dB do you need at 40 Hz vs. 4000 Hz? A. 10 B. 50 C. 40 E. 75 The question is incorrect. You actually need more sound intensity for the the 4000 Hz tone The 50 phon curve on the Fletcher-Munson figure could be relabeled as: A. 0.1 sones B. 3 sones C. 9 sones D. The 50 phon curve cannot be identified with a single sone number Use the Fletcher-Munson curves for the following: You have a 200 Hz sound played at 100 dB. How loud of a sound do you have to play at 50 Hz to be perceived as equally loud? A. 90 dB B. 100 dB C. 110 dB D. 120 dB You play a 1000 Hz sound at 80 dB. What sound intensity level do you need at 200 Hz to be perceived as equally loud? A. 60 dB B. 70 dB C. 80 dB D. 90 dB You first hear one pair of notes, and then you hear another pair of notes. In which case will you perceive a greater change in pitch? A. 46 Hz to 99 Hz B. 2000 to 3500 Hz They would be perceived as an equal change in pitch A musical piece in % is marked as mm = 73. If it is 89 measures long, how long will it take to play? A. 103 seconds B. 158 seconds C. 219 seconds D. 450 seconds You are playing 2 pure tones: one with a frequency of 115 Hz and the other with a frequency of 345 Hz. How long does it take for the overall combined wave pattern to repeat? A. 2.899 milliseconds B. 3.456 seconds C. 8.696 seconds D. 10.456 seconds E The wave pattern will never repeat All of the following frequencies belong to the same simple harmonic series except for one. Which one does not belong to the same simple harmonic series as the others? A. 134 B. 268 C. 335 D. 402 E. 536 How much time does one beat get for M.M = 120? A. 0.5 sec B. 1 sec C. 2 sec D. 2.5 sec E. 120 sec What note is an octave above E_4? A. B_6 B. E_5 C. C_3 D. F_3 E. D_2 What note is a fifth above E_4? A. B_4 B. E_3 C. C_5 D. F_3 E. D_6Explanation / Answer
pinna is the visible part of the outer ear and in the funnel shape to collect the sound ,it amplifies and transmits the sound,
hence the pinna is more useful for locating the sources of short wavelength sounds
speed of sound is v = lamda* frequency
since v is constant ,for shorter wavelength of sound frequency is high
so the answer is A) HIGH