X-rays are produced using a potential difference of V. The spectrum of wavelengths is found to contain
A. a single wavelength.
B. all wavelengths from zero up to a maximum.
C. all wavelengths from a minimum to a maximum.
D. only discrete wavelengths.
C. all wavelengths from a minimum to a maximum.
You might also like to view...
The volume holding 0.63 mole of an ideal gas is compressed to 1/4 of its original volume by a piston. At the same time the pressure of the gas triples. If the original absolute temperature of the gas was T, that is the new temperature after compression?
a. 4/3T c. 0.63(3/4T) b. 3/4T d. 0.63(4/3T)
To which compositional group do asteroids mainly belong?
A. silicates B. metallic iron-nickel C. carbonaceous D. All of these choices are correct.
It is desired to project the image of an object four times its actual size using a lens of focal length 20 cm. How far from the lens should the object be placed?
A) 100 cm B) 80 cm C) 4.0 cm D) 25 cm E) 5.0 cm
A charged particle (mass = m, charge = q > 0) moves in a region of space where the magnetic field has a constant magnitude of B and a downward direction. What is the magnetic force on the particle at an instant when it is moving horizontally toward the north with speed v?
a. qvB toward the east b. Zero c. qvB toward the west d. qvB upward e. qvB toward the south