When an atom's electrons fall down to lower energy levels in a thin cloud of hot gas, what is produced?
A) thermal radiation
B) an absorption line spectrum
C) an emission line spectrum
D) an infrared spectrum
E) new interstellar compounds
C) an emission line spectrum
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The half-life of 131I is 8 days. On a certain day, the activity of an 131I sample is 6.4 mCi. What is its activity 40 days later?
Circular Motion of Charges: A proton is accelerated from rest through 0.50 kV. It then enters a uniform magnetic field of 0.30 T that is oriented perpendicular to its direction of motion.(a) What is the radius of the path the proton follows in the magnetic field?(b) How long does it take the proton to make one complete circle in the magnetic field?.
What will be an ideal response?
A baseball player throws a ball straight up into the air. At a height of 3.00 m above the release point, the ball is moving at 1.25 m/s. What was the ball's initial speed?
a. 7.56 m/s b. 7.77 m/s c. 57.2 m/s d. 60.4 m/s
A circular loop is suspended in a uniform magnetic field as shown in the figure
?
If the loop area increases, what affect does this have on the induced current?
a.
The induced current is clockwise.
b.
The induced current is counterclockwise.
c.
There is no induced current.
d.
We would need to know the magnitude of the magnetic field.