Matter Waves: If a proton and an electron have the same de Broglie wavelengths, which one is moving faster?
A. the electron
B. the proton
C. They both have the same speed.
Answer: A
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A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J. He slides part way down the hill to a point where his gravitational potential energy is 200 J. His kinetic energy at that point will be
a. 200 J b. 300 J c. some unknown value between 0 and 500 J d. none of the above
Why were elements heavier than helium not produced during the Big Bang?
What will be an ideal response?
Three identical springs each have the same spring constant k. If these three springs are attached end to end forming a spring three times the length of one of the original springs, what will be the spring constant of the combination?
a. k b. 3k c. k/3 d. 1.73k
As you stand by the side of the road, a car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz
What is the speed of the car? The speed of sound in the air is 343 m/s. A) 26 m/s B) 27 m/s C) 28 m/s D) 29 m/s E) 30 m/s