A v-t graph is drawn for a ball moving in one direction. The graph starts at the origin and at t = 6 s the acceleration of the ball is zero. We know that at t = 6 s,
a. the slope of the curve is non-zero.
c. the velocity of the ball is not changing.
b. the curve is not crossing the time axis.
d. the curve is at v = 0, t = 0.
C
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A 29.0-pm-wavelength photon is scattered by a stationary electron. What is the maximum energy loss the photon can have?
(melectron = 9.11 × 10-31 kg, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J) A) 4.0 keV B) 6.1 keV C) 10 keV D) 12 keV E) 15 keV
The splitting of a large nucleus into two smaller nuclei upon absorbing a neutron is __________
Fill in the blank(s) with correct word
For most of history, the lack of observable stellar parallax was interpreted to mean that
A) stars must all lie at the same distance from Earth, on the celestial sphere. B) stars were too far away for parallax to be measured with available technology. C) Earth is stationary at the center of the universe. D) Galileo's theories of the universe were essentially correct.
Scattered light in the atmosphere is often partially polarized. The best way to determine whether or not light from a particular direction in the sky shows polarization is to
a. diffract the light through a single slit. b. squint while looking in that direction. c. rotate a piece of polaroid film about an axis parallel to the ray while looking through it in that sky direction. d. rotate a piece of polaroid film about an axis perpendicular to the ray while looking through it in that sky direction. e. reflect the rays from that direction on a shiny metal surface.