The Doppler Effect is the apparent change in:
a) Speed
b) Light
c) Sound
d) Frequency
Ans: d) Frequency
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Current: If 3.0 × 1015 electrons flow through a section of a wire of diameter 2.0 mm in 4.0 s, what is the current in the wire? (e = 1.60 × 10-19 C)
A. 0.12 mA B. 0.24 mA C. 7.5 × 107 A D. 7.5 × 1014 A
At different times of the year, the Sun appears to be in different parts of the sky among different groups of stars. This is so because
a. Earth revolves about the Sun. b. the Sun rotates on its axis. c. the Sun moves through space. d. stars move. e. Earth rotates on its axis.
A beaker of negligible heat capacity contains 456 g of ice at -25.0°C. A lab technician begins to supply thermal energy through the process of heating to the container at the rate of 1000 J/min
How long after starting will the ice begin to melt, assuming all of the ice has the same temperature? The specific heat of ice is 2090 J/kg ? K and the latent heat of fusion of water is 33.5 × 104 J/kg.
Radio maps of the spiral arms of our galaxy
a. reveal that our galaxy is a grand design spiral. b. map the location of hot O and B stars by the radio radiation they emit. c. reveal that the spiral arms are winding up and growing closer together. d. reveal that the Sun is currently located in the center of a spiral arm. e. map the location of dense neutral hydrogen clouds.