The ________-year solar cycle is characterized by a variation in the number of sunspots and a reversal of the polarity of the Sun as a whole
Fill in the blank(s) with correct word
22
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The x-rays that occur when a high energy electron beam is incident on a metal target will show what type of spectrum?
a. continuous b. line c. continuous spectrum superimposed with a line spectrum d. absorption
A pulley system holding a rope that is pulled out a distance of 20 m is used for lifting a 2500 kg grand piano. The piano can be raised 3 m by application of a 375 N force to the rope
What will be an ideal response?
In the Bohr model of the hydrogen atom, the electron circles the proton at a distance of 0.529 × 10?10 m. Find the potential at the position of the electron.
What will be an ideal response?
The circuit below shows three resistors in series. R3 > R2 > R1. The resistors are all made of the same wire with the same diameter but have different lengths. Rank the magnitudes of the electric fields in the resistors from least to greatest
a.
E3 < E2 < E1.
b.
E2 < E1 = E3.
c.
E1 = E2 = E3.
d.
E1 = E3 < E2.
e.
E1 < E2 < E3.