An electron has the same de Broglie wavelength as the wavelength of a 1.8 eV photon. What is the speed of the electron?
(melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J)
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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The two names most associated with the discovery of Pluto are
A) Adams and Leverrier. B) Herschel and Bode. C) Kuiper and Whipple. D) Lowell and Tombaugh. E) Shoemaker and Levy.
The energy involved in a phase change is called the
a. specific heat. b. thermal energy. c. internal energy. d. latent heat.
Wind blows at 50 m/s around a 5 cm diameter electric power line when the air temperature is -10ºC. Estimate the heat loss of the power line per unit length if the surface temperature of the power line is 5ºC.
What will be an ideal response?
All the jovian planets lie beyond the asteroid belt
Indicate whether the statement is true or false