An electron has the same de Broglie wavelength as a 1.8 eV photon. The speed of the electron is closest to:
A) 1,100 m/s
B) 980 m/s
C) 910 m/s
D) 840 m/s
E) 770 m/s
A
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An electron of mass 9.11 × 10^-31 kg moves with a speed of 0.800c. What is its momentum? (c = 3.00 × 10^8 m/s)
a. 3.64 × 10^-22 kg×m/s c. 6.03 × 10^-22 kg×m/s b. 2.05 × 10^-22 kg×m/s d. 1.34 × 10^-22 kg×m/s
Why is Saturn's moon Titan able to retain an atmosphere?
a. Titan only contains light gases which are easy to retain. b. Titan has a large enough mass and is cold enough. c. Titan is biologically active. d. It is so close to Saturn that Saturn's gravity retains Titan's atmosphere.
Daisy throws a rock horizontally with a speed of 12.0 m/s from a bridge. It falls 2.28 s before reaching the water below
(a) When the rock hits the water it is traveling with what horizontal component of velocity? (b) What was the total speed just before hitting the water?
Conversion of Units: At a certain time, the average size of a transistor in a microprocessor was 250 nanometers. A human hair has a diameter of 70 microns (micrometers). How many transistors fit across a human hair?
A. 280 B. 28 C. 2800 D. 2.8 E. 0.28