A proton that is moving freely has a wavelength of 0.600 pm. (mproton = 1.67 × 10-27 kg, e = 1.60 × 10-19 C, h = 6.626 × 10-34 J ? s)
(a) What is its momentum?
(b) What is its speed?
(c) What potential difference would it have been accelerated through, starting from rest, to reach this speed?
(a) 1.10 × 10-21 kg ? m/s (b) 6.61 × 105 m/s (c) 2.28 kV
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Radiation: In an electric furnace used for refining steel, the temperature is monitored by measuring the radiant power emitted through a small hole in the wall of the furnace, of area 0.5 cm2. This hole acts like a perfect blackbody radiator having the same temperature as the interior of the furnace. If the temperature of the furnace (and therefore of the hole) is to be maintained at 1650°C, how much power will the hole radiate?
A. 20 W B. 30 W C. 40 W D. 50 W
The natural background radiation we personally encounter is
A) a trace amount. B) about a quarter. C) about half. D) more than half.
In a steady flow in a long pipe, such as the Alaska oil pipe line, the Eulerian description of the velocity field would express the velocity V in the pipe as:
(A) V(t) (B) V(r) (C) V(r, t) (D) V(r, z)
In the figure shown, what is a likely reason the two examples of colored text differ in color?
A. The links point to different kinds of content, such as a video and a subsidiary webpage. B. The color of one link has changed to indicate a followed link. C. The branding of the organization's webpage includes both of these colors. D. One color is intended to show greater emphasis.