Assume electrons are accelerated through a potential difference of 25 000 V inside a TV picture tube. What is the minimum wavelength that could be produced when the electrons strike the phosphor? (1 Å = 10-10 m)
a. 0.50 Å
b. 1.0 Å
c. 10 Å
d. 100 Å
e. 0.25 Å
A
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Which color of light has the lowest energy photons?
A) red B) yellow C) green D) blue E) orange
Three point charges, two positive and one negative, each having a magnitude of 20 ?C are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on the negative charge?
a. 80 N b. 40 N c. 69 N d. 57 N e. 75 N
Each of two small non-conducting spheres is charged positively, the combined charge being 40 ?C. When the two spheres are 50 cm apart, each sphere is repelled from the other by a force of magnitude 2.0 N. Determine the magnitude of the smaller of the two charges
a. 1.4 ?C b. 1.1 ?C c. 2.0 ?C d. 3.3 ?C e. 17 ?C
According to two different estimates, coal reserves can be 250 Gt or 450 Gt, almost twice as much. Why is it so difficult to pin down the reserves' total?
What will be an ideal response?