The beam in a cathode ray tube is moved by an electric force. what did
scientists infer about atoms from this experimental result?
o
a. atoms are small particles that cannot be destroyed or divided.
b. atoms have a dense, positively charged center
o
c. electrons have more energy the farther they are from the nucleus.
o
d. atoms are made up of smaller particles.

What is the thinnest soap film (excluding the case of zero thickness) that appears black when illuminated with light with a wavelength of 480 ? the index of refraction of the film is 1.34, and there is air on both sides of the film. express your answer in nanometers. hint 1. how to approach th

An object with initial temperature 130 ∘ f is submerged in large tank of water whose temperature is 50 ∘ f . find a formula for f ( t ) , the temperature of the object after t minutes, if the cooling constant is k = − 0.2 . remember newton's law of cooling (the rate of change of temperature with respect to time is equal to k times the difference between the temperature of the object and the surrounding temperature) ! : )

Area around a charged object where the objects can exert a force on another charged objects is an electric