A ball rolling down a hill has a constant acceleration of 3 m/s2 . If the ball's mass is 2.5 kg, what is the net force acting on the ball?
7.5 N
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X-Ray Diffraction: Certain planes of a crystal of halite have a spacing of 0.399 nm. The crystal is irradiated by a beam of x-rays. First order constructive interference occurs when the beam makes an angle of 20° with the planes of the crystal surface. What is the wavelength of the x-rays?
A. 0.14 nm B. 0.17 nm C. 0.21 nm D. 0.24 nm E. 0.27 nm
Which of these is the same for all forms of electromagnetic (E-M) radiation in a vacuum?
A) photon energy B) amplitude C) speed D) wavelength E) frequency
Saturn's atmosphere
a. has more distinctive zones and belts than Jupiter's. b. is rich in free oxygen. c. is hazy above the clouds. d. is all of the above e. is none of the above
When light from air hits a smooth piece of glass with the ray perpendicular to the glass surface, the part of the light passing into the glass:
a. will not change its speed. b. will not change its frequency. c. will not change its wavelength. d. will not change its intensity.