Two long straight parallel lines of charge, #1 and #2, carry positive charge per unit lengths of ?1 and ?2 respectively. ?1 > ?2. The electric field halfway between the lines, which are separated by a distance a, has magnitude
What will be an ideal response?
(?1 - ?2)/? ?Oa.
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Gamma rays are emitted by way of
A) ionizing radiation. B) transitions within an atom's innermost electrons. C) transitions within the atomic nucleus. D) none of the above
In order to be able to directly see the Sun's motion due to Jupiter's gravity, an observer at a distance of 30 light-years would need to be able to measure changes in its position of ________
A) 0.0005 arcsecond B) 0.05 arcsecond C) 0.005 arcsecond D) 0.5 arcsecond
An ancient rock is found to contain 40Ar gas, indicating that 77% of the 40K in the rock has decayed since the rock solidified. Any argon would have boiled out of liquid rock. The half-life of 40K is 1.25 billion years
How long ago did the rock solidify? A) 2.6 billion years B) 0.50 billion years C) 1.8 billion years D) 0.30 billion years
Over geologic history the Earth's magnetic field
A) has been relatively stable. B) has increased in strength exponentially. C) has reversed direction many times. D) is unknown.