A note is played on a saxophone with a frequency of 258 Hz while a nearby piano plays a note with a frequency of 261 Hz. A pattern of regularly alternating louder and softer tones
("beats") is heard. Which of the following explains this?
A. Reflection
B. Interference
C. Resonance
D. Absorption

Calculate the heat capacity per object when the total energy is 4 quanta. (think of this in terms of increasing from 3.5 quanta of energy in the system to 4.5 quanta of energy in the system, if that were possible.) c4 = __ j/k/object

The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?

If an astronaut takes an object to the moon the following is true (choose only one). a the mass will change but the weight will be the same. b both the mass and the weight of the object will be the same. c the weight will change but the mass will be the same. d both the mass and the weight of the object will change.