Approximately how long after the Big Bang did the era of nucleosynthesis end, marking the time when the basic chemical composition of the universe was determined?
A) 10-10 second
B) 0.001 second
C) 5 minutes
D) 380,000 years
E) 5 million years
C) 5 minutes
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When viewed through a small telescope, galaxies appear bright, with a definitive edge.
Answer the following statement true (T) or false (F)
The Big Bang predicts that after the universe was born it
A) consisted of an equal mixture of all the chemical elements B) was completely empty C) consisted of mostly hydrogen and helium D) consisted of mostly carbon, hydrogen, oxygen and nitrogen
If the z-component of the magnetic field of an electromagnetic wave traveling in the +x direction through vacuum obeys the equation
Bz(x, t) = (1.25 ?T) cos[(3800 m-1)x - (1.14 × 10-12 rad/s)t], what is the largest that the y component of the electric field can be? (c = 3.0 × 108 m/s) A) 375 N/C B) 4.17 × 10-15 N/C C) 3.75 × 108 N/C D) 4.17 × 10-9 N/C E) 1.25 × 106 N/C
If an object's velocity is constant, its speed must also be constant
a. True b. False Indicate whether the statement is true or false