The pollutant primarily responsible for acid rain is
a. NO2.
b. CO2.
c. O3.
d. SO2.
d
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General Questions: Bill and his daughter Susan are both standing on identical skateboards (with really good frictionless ball bearings), initially at rest. Bill weighs three times as much as Susan. Bill pushes horizontally on Susan's back, causing Susan to start moving away from Bill. Just after Bill stops pushing,
A. Susan and Bill are moving away from each other, and Susan's speed is three times that of Bill. B. Susan is moving away from Bill, and Bill is stationary. C. Susan and Bill are moving away from each other, with equal speeds. D. Susan and Bill are moving away from each other, and Susan's speed is one-third that of Bill.
Probably the best-known comet is ______________ Comet
a. Sally's b. Bally's c. Bailey's d. Malley's e. Halley's
The figures below represent interference fringes. The distances from the screen to the slits is the same for each figure, and the planes of the screen and the slits are parallel. In each figure the spacing d between the slits is the same. Which figure(s) represent(s) slits illuminated with light of the shortest wavelength ?? The white spaces represent the interference maxima
a.
I.
b.
II.
c.
III.
d.
IV.
e.
V.
An image seen projected on a screen by a single lens is always inverted
Indicate whether the statement is true or false