The beam in a cathode ray tube is moved by an electric force. what did
scientists infer about atoms from this experimental result?
a. atoms are small particles that cannot be destroyed or divided.
b. atoms have a dense, positively charged center
c. electrons have more energy the farther they are from the nucleus.
d. atoms are made up of smaller particles.
speed = 1.6 m/s
need to know how many steps/s
then we can calculate how long each step is
with the angle between the 2 legs known
then we can calculate the length of legs.
there is a difference between the energy of their ground electronic state, where no electrons have been excited by an incoming photon, and their excited electronic state, where at least one electron has been moved to a higher orbital than it normally occupies. the difference between these 2 states determines how much energy they absorb when they get excited and emit when they relax (go back to their ground state). energy of light absorbed or emitted =planck's constant*frequency of light absorbed or emitted. frequency of light = speed/wavelength.
1) negative acceleration, but positive velocity
if a ball is thrown up then velocity is positive upwards while acceleration is downwards negative
2) positive acceleration and positive velocity
if a car is moving towards positive direction with increasing speed due to which acceleration is also positive in it
3) positive acceleration, but negative velocity
if a car is moving towards negative direction and car apply brakes due to which it will slow down then its acceleration must be positive
4) negative acceleration and negative velocity
when a ball is falling downwards under the influence of gravity then velocity and acceleration both are positive
5) positive velocity and no acceleration
if an object is moving with uniform speed towards positive x direction without any acceleration or force
scientists infer about...