Why does light come in different colors?
a) differences in the wavelength
b) it travels at different speeds
c) warping of space it travels through
d) differences in intensity of radiation
e) bending of light in space
Ans: a) differences in the wavelength
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Collisions in Two Dimensions: A 1500-kg car traveling at 90 km/h toward the east suddenly collides with a 3000-kg car traveling at 60 km/h toward the south. The two cars stick together after the collision. What is the direction of motion of the cars after collision?
A. 36.9° S of E B. 36.9° E of S C. 53.1° S of E D. 53.1° E of S
You observe an object to be moving in a straight line at a constant speed. What can you conclude? (Assume the object does not have any engines or other power source.)
A) The net force acting on the object is zero. B) No forces of any kind are acting on the object. C) The only force acting on the object is gravity. D) The only force acting on the object is air resistance. E) Some unseen force must be keeping the object in motion.
State the relationship between frequency, photon energy, and wavelength
What will be an ideal response?
The neutrino is
a. a little neutron. b. another name for a positron. c. the particle detected in carbon dating. d. a particle proposed to account for "missing" energy and momentum in beta decay.