Glass panes are opaque to a certain type of radiation, which passes through quartz. What type of radiation is it? This radiation is important in ozone layer reactions
a. microwave
b. gamma
c. x-ray
d. ultraviolet
d
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Which of these two collisions is more damaging; driving into a concrete wall with no "give," or colliding head-on with an identical car moving toward you at your same speed?
A) collision with the car B) collision with the wall C) both the same
According to the Rutherford model of the atom, most of the volume of an atom
a. is empty space. b. was occupied by the nucleus. c. contained positive charges. d. excluded electrons.
An object is placed 100 cm in front of a diverging lens with a focal length of magnitude 25 cm. A converging lens having a focal length of magnitude 33.33 cm is placed 30 cm past the first lens. Where is the final image formed?
A) 3.0 meters before the second lens B) 100 cm after the second lens C) 30 cm after the second lens D) 20 cm in front of the first lens E) 3.0 cm before the second lens
A camper is about to drink his morning coffee. He pours 400 grams of coffee, initially at 75.0°C, into a 250-g aluminum cup, initially at 16.0°C
What is the equilibrium temperature of the coffee-cup system, assuming no heat is lost to the surroundings? The specific heat of aluminum is 900 J/(kg?K). Assume that the specific heat of coffee is the same as the specific heat of water. A) 45.5°C B) 62.0°C C) 65.0°C D) 68.0°C E) 71.0°C