Fourier discovered that periodic waves can be represented by
A) a series of non-periodic waves.
B) the summation of a series of simple sine waves.
C) a binary code.
D) pulses of the same amplitude.
Answer: B
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Two metal spheres are made of the same material and have the same diameter, but one is solid and the other is hollow. If their temperature is increased by the same amount,
A) the solid sphere becomes denser and the hollow one less dense. B) the two spheres remain of equal size. C) the solid sphere becomes less dense and the hollow one denser. D) the solid sphere becomes bigger than the hollow one. E) the hollow sphere becomes bigger than the solid one.
The acceleration of the Universe depends on the effect of ____
a. baryonic matter being greater than the effects of dark matter and dark energy b. baryonic matter and dark energy being greater than the effect of dark matter. c. dark matter and dark energy being greater than the effect of baryonic matter. d. baryonic matter and dark matter being greater than the effect of dark energy. e. dark matter being greater than the effect of dark energy.
Kinetic Energy: An electron has a relativistic momentum of 1.1 × 10-21 kg ? m/s. What percent of its total energy is its kinetic energy? (melectron = 9.11 ×10-31 kg, c = 3.0 × 108 m/s)
Fill in the blank(s) with the appropriate word(s).
A beam of light travels a distance of 2900 m. How much time does it take?
A) 9.7 s B) 9.7 ms C) 9.7 ?s D) 9.7 ns E) 9.7 ps