If an x-ray machine were designed to operate at two separate accelerating voltages, one double the other, how would the shortest wavelength, ?min,h?, and the maximum frequency, fmax,h?, at the higher voltage compare to those (?min,lv, fmax,lv) at the lower voltage? ?min,hv/ ?min,lv = ________, fmax,hv/ fmax,lv =________:
a. 2, 2.
b. 2, 1/2.
c. 1/2, 2.
d. 1/2, 1/2.
c
Physics & Space Science
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A volume of helium gas has a temperature of 10°C. The same gas twice as hot has a temperature of
A) 20°C. B) 12°C. C) 283°C. D) 293°C. E) none of the above
Physics & Space Science
Assume molecules have an average diameter of 3.00 × 10^?10 m. How many times larger is the mean free path than the diameter at one atmosphere and 0°C?
a. 500 b. 300 c. 700 d. 1 000 e. 2 500
Physics & Space Science
An emf is induced in a wire by changing the current in that wire
Indicate whether the statement is true or false
Physics & Space Science
As the planets orbit the Sun, they are never far from the ________ on the celestial sphere.
A. horizon B. meridian C. celestial equator D. celestial pole E. ecliptic
Physics & Space Science