Matter waves are also called ______________ waves
Fill in the blank(s) with correct word
de Broglie
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Human reaction time is usually greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before you catch it?
A. at least 3.0 cm B. at least 4.9 cm C. at least 6.8 cm D. at least 9.8 cm
The intensity of sunlight falling on the earth is about 1.4 kW/m2 (before any gets absorbed by our atmosphere). At what rate does the sun emit light energy? (The earth-sun distance = 1.5 × 108 km and the earth's radius = 6.4 × 103 km.)
A) 4.0 × 1026 W B) 3.2 × 1022 W C) 7.2 × 1014 W D) 7.6 × 108 W
A difference between the special and general theories of relativity is that
A. special relativity is valid only in stationary reference frames. B. special relativity deals with accelerated systems. C. general relativity deals with accelerated systems. D. general relativity only deals with swiftly moving objects.
Identical point charges (+30 mC) are placed at the corners of a rectangle (4.0 m × 6.0 m). How much external energy is required to bring a charge of 55 mC from infinity to the midpoint of one of the 6.0-m long sides of the rectangle?
a. 22 J b. 16 J c. 13 J d. 19 J e. 8.0 J