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final - 1 What is the wavelength of 345 Hz sound in air if...

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1. What is the wavelength of 345 Hz sound in air if the speed of sound is 345 m/s? A. 0.1 meters B. 0.345 meters C. 1.0 meter D. 3.45 meters E. sound is not characterized by wavelength C

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2. Why is it difficult to localize sound under water? A. sound doesn’t travel under water B. sound is heavily attenuated (suppressed) underwater C. our ears can’t hear sound underwater D. sound speed is fast in water, throwing off our “calculation” E. sound doesn’t have a localized source under water D
3. Mid-range sound is about 1 kHz. What is the wavelength of mid-range sound? ( c = 345 m/s) A. 0.1 m B. 0.345 m C. 1.0 m D. 3.45 m B

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4. About how big would you expect a midrange (about 1000 Hz) speaker to be? A. There are no physical restrictions on its size B. Less than 0.345 m across C. Greater than 0.345 m across D. Depends how much you pay: \$\$\$ bigger E. It’s mostly a matter of aesthetics/design B
5. How do you differentiate a piano from a violin if both are playing the same note? A. The main wavelength of the two is different B. The main frequency of the two is different C. The amplitude of the sound wave is different D. The two look different on an oscilloscope E. The high-frequency content is different for the two E, but D true

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1. What is the binary number 1001 in decimal? A. 5 B. 9 C. 15 D. 21 E. 1,001 B
2. Convert 13 into binary (4 bits is all you need): A. 1011 B. 1100 C. 1101 D. 1110 E. 1111 C

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3. What is one plus one in binary? A. 1 B. 2 C. 10 D. 11 E. 20 C
4. Add 1011 and 0011 in binary form. What do you get? A. 1000 B. 1100 C. 1110 D. 1111 E. 10000 C

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5. When you wipe a CD, you may scratch it. Would you rather risk a radial scratch or a tangential scratch? A. Neither one is likely to have an effect B. Both will have the same effect C. The radial scratch is worse: affects many spirals D. The tangential scratch is worse: many bits in a row disrupted E. CDs cannot be scratched E
1. What logic table would you get out of a NAND gate with the inputs tied together? A B C 0 0 1 0 1 1 1 0 1 1 1 0 NAND A C 0 0 1 0 A C A C 0 0 1 1 A C 0 1 1 0 A C 0 1 1 1 A B C D C

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2. What is (1 AND 1) OR (0 AND 1)? A. 0 B. 1 C. indeterminate 1 1 0 1 ? A B C 0 0 0 0 1 0 1 0 0 1 1 1 AND A B C 0 0 0 0 1 1 1 0 1 1 1 1 OR B
3. Which of the following functions does this contraption look like (using only NAND gates)? A. NAND B. AND C. OR D. NOR E. XOR A B C 0 0 0 0 1 1 1 0 1 1 1 1 OR A B C 0 0 0 0 1 0 1 0 0 1 1 1 AND A B C 0 0 1 0 1 1 1 0 1 1 1 0 NAND A B C C

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4. How do TV remotes communicate with the TV? A. bursts of radio waves B. ultrasonic acoustic (sound) pulses C. bursts of infrared light D. via electrons/current flow E. by manipulating the electric field in the room C
5. Why do you think the remotes avoid long sequences of ones or zeros (staccato nature)? A. this is the most efficient way to encode data

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final - 1 What is the wavelength of 345 Hz sound in air if...

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