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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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?
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.
All the jovian planets lie beyond the asteroid belt
Indicate whether the statement is true or false
The energy involved in a phase change is called the
a. specific heat. b. thermal energy. c. internal energy. d. latent heat.