The sound level at 1.0 m from a certain talking person talking is 60 dB. You are surrounded by five such people, all 1.0 m from you and all talking equally loud at the same time
The threshold of hearing is 1.0 × 10-12 W/m2. What sound level are you being exposed to? You can neglect any absorption, reflection, or interference of the sound. The threshold of hearing is
1.0 × 10-12 W/m2.
A) 300 dB
B) 60 dB
C) 74 dB
D) 67 dB
E) 81 dB
Answer: D
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Meters: A galvanometer can be converted to an ammeter by the addition of a
A. small resistance in parallel. B. large resistance in parallel. C. small resistance in series. D. large resistance in series.
How should we expect the Milky Way's interstellar medium to be different in 50 billion years than it is today?
A) The total amount of gas will be about the same, but the percentage of elements heavier than hydrogen and helium will have risen from the current 2% to more than 50%. B) The total amount of gas will be much greater, since many stars will undergo supernovae between now and then. C) The total amount of gas will be much less than it is today. D) Thanks to the recycling of the star-gas-star cycle, the interstellar medium should look about the same in 50 billion years as it does today.
Which of the following is not one of the three main categories of observation generally used by astronomers?
A) filtering to look at just a single color from an object B) time monitoring to track how an object's brightness varies with time C) spectroscopy to spread an object's light into a spectrum D) imaging to get a picture of an astronomical objects
Two identical tiny balls of highly compressed matter are 1.50 m apart. When released in an orbiting space station, they accelerate toward each other at 2.00 cm/s2. What is the mass of each of them? (G = 6.67 × 10-11 N ? m2/kg2)
What will be an ideal response?