Blue light will not eject electrons from a certain metal; however, which one of the following may possibly eject electrons from that metal?
a. infrared
b. ultraviolet
c. red
d. green
b
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A rod (length = 2.0 m) is uniformly charged and has a total charge of 5.0 nC. What is the electric potential (relative to zero at infinity) at a point which lies along the axis of the rod and is 3.0 m from the center of the rod?
a. 22 V b. 19 V c. 16 V d. 25 V e. 12 V
As air rises, it cools and clouds can form. The rate of cooling determines the elevation of cloud formation and cloud thickness. From first to last, the rates of cooling are
A) dry adiabatic lapse rate—cloud base; moist adiabatic lapse rate—cloud thickness; environmental lapse rate—upper limit of cloud. B) moist adiabatic lapse rate—cloud base; dry adiabatic lapse rate—cloud thickness; environmental lapse rate—upper limit of cloud. C) environmental lapse rate—cloud base; moist adiabatic lapse rate—cloud thickness; dry adiabatic lapse rate—upper limit of cloud.
How does the force of gravity between galaxies affect the recessional velocity of the galaxies? How would this affect the value of Hubble's constant? The calculated age of the universe? Explain your answers
What is the approximate age of a star cluster where the brightest main sequence stars are G stars?
A) 10 billion years B) 100 billion years C) 10 million years