1) The ratio of the speed of sound in water to the speed of sound in air is a) l
ID: 1309624 • Letter: 1
Question
1) The ratio of the speed of sound in water to the speed of sound in air is
a) less than 2
b) between 2 and 3
c) between 3 and 4
d) between 4 and 5
2) For the same frequency which sound would have a greater wavelenght
a) a sound in air
b) a sound in water
c) a sound in a piece of metal
d) same for all
e) none of the above
3) Consider two sound waves: One is at 0 dB and the other is at 20 dB. How much more intense is the sound at 20 dB compared to the sound a 0 dB?
a) 100 times
b) 1,000 times
c) 10,000 times
d) 100,000 times
e) 1 million times
f) none of the above
4) Consider problem 3 on page 367. The depth of the water directly bellow the vessel is 4590 meter. What is the presssure from the sea water at this depth, in unit of kilo pascal? The weight density for sea water is 10.045 (kilo-pacasl)/meter.
a) less than 10,000
b) between 10,000 and 20,000
c) between 20,000 and 30,000
d) between 30,000 and 40,000
e) between 40,000 and 50,000
f) none of the above
5) To say that a charge is conserved is to say that electric charge
a) may occur in an infinite variety of quantities
b) is a whole number multiples of the charge of one electron
c) will interact with neighboring electric charge
d) can be neither created nor destroyed
e) is something negative
6) Consider figure 22.26 pn page 397. A proton is brought near the charged balloon then it is allowed to move. Next, an electron is brought near the charged balloon and it is allowed to move. Which would experience a greater force?
a) the proton
b) the electron
c) same for both of them
d) none of the above
7) Consider problem 1 on page 403. Two charges are separated by 6 centimeter. The force of attraction between them is 20 newton. If both charges are doubled and the distance between theme is also doubled, the attractive force would be
a) 5 newton
b) 10 newton
c) 20 newton
d) 40 newton
e) 80 newton
f) none of the above
8) Consider problem 7 on page 403. The potential difference between a storm cloud and the ground is 100 million volts. A charge of 2 coulomb flashes in a lightning bolt from cloud to earth. How many elementary charge are there 2 coulomb?
a) 1.25 x 10^16
b) a) 1.25 x 10^17
c) a) 1.25 x 10^18
d) a) 1.25 x 10^19
e) a) 1.25 x 10^20
f) none of the above
9) Your electronic friend needs a 25 Ohm resister, but only has 20 Ohm ones. How should he combine the 20 Ohn resistors to produce an equivalent resistnace of 25 Ohm?
a) combine them in series
b) combine them in parallel
c) combine them in series and also combine them in parallel
d) none of the above
10) Consider the above question. How many 20 Ohm resistors would be needed to make an equivalent resistance of 25 Ohm?
a) an even number of 20 Ohm resistors
b) an odd number of 20 Ohm resistors
c) none of the above
11) Consider problem 7 on page 423. The amount of energy the 4 watt night light consumes in 1 year is about 126 million joules. How much liquid water could be heated from 0 deg to 100 deg from this energy ( 1 cal = 4.18 J)?
a) less than 300 kilogram
b) between 300 and 350 kilogram
c) between 350 and 400 kilogram
d) between 400 and 450 kilogram
e) more than 450 kilogram
f) none of the above
12) Consider problems 3 and 4 on page 471. What is the ratio of travel times for light from the sun to the earth compared to the light from the moon to the earth?
a) ratio is less then 500
b) ratio is between 500 and 700
c) ratio is between 700 and 900
d) ratio is between 900 and 1100
e) ratio is more than 1100
f) none of the above
13) Consider problem 8 on page 471. How much more faster does light travel in water compared to that in a piece of Plexiglass?
a) less than 1.05 times
b) between 1.05 and 1.1 times
c) between 1.11 and 1.2 times
d) between 1.2 to 1.3 times
e) more than 1.3 times
f) none of the above
Explanation / Answer
1. d In fresh water, sound travels at about 1497 m/s at 25
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