X-rays are ________ waves of ________ wavelength.
What will be an ideal response?
electromagnetic, short
electromagnetic, low
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A 0.50-kg mass attached to the end of a string swings in a vertical circle (radius = 2.0 m). When the mass is at the lowest point on the circle, the speed of the mass is 12 m/s. What is the magnitude of the force of the string on the mass at this position?
A. 31 N B. 36 N C. 41 N D. 46 N E. 23 N
The brilliant nuclei of Seyfert galaxies change brightness rapidly, in only a few hours or minutes, especially at _____
A) microwave wavelengths B) visible light wavelengths C) gamma ray wavelengths D) X-ray wavelengths
A ray in air is incident on a glass plate whose index of refraction is 1.42. The angle of refraction is one half the angle of reflection. The angle of refraction is closest to:
A) 45° B) 43° C) 41° D) 39° E) 37°
An electron is briefly accelerated in the direction shown in the figure below and to the left. It creates an EM wave pulse that eventually reaches points P and S 
What is the direction of the wave’s motion at point P?
A. A B. B C. C D. D E. Toward the viewer. F. Away from the viewer. T. The vector is zero. G. AA