Waves
What are the two types of waves?
Longitudinal and transverse
What is the simple way to calculate a half-life?
Divide by 2
How do you calculate for resistance?
Voltage divided by current (V/I)
What is circular motion?
The movement of an object in a circular path.
What two kinds of collisions conserve momentum?
Elastic and inelastic
Which one carries more energy: a wave with a big wavelength or a wave with a small wavelength?
a wave with a small wavelength carries more energy
What kind of decay is a half-life?
Radioactive decay
What is the unit for current?
Amps
What happens to the radius of a circle if the force stays the same and the velocity increases?
The radius increases.
How do you calculate momentum?
mass times velocity
What kind of relationship does the period and wavelength of a wave have?
an inversely relative relationship
What nuclide has the longest half-life span?
Uranium-238: 4.47 x 10^9 years
In a circuit, if the battery has a voltage of 25 and the resistance is 4, what is the current?
6.25 A
What kind of variables are used to measure circular motion?
Angular variables
What is the momentum of two objects that are at rest?
Zero
What’s the point of the Doppler Effect?
To determine the change in frequency of a wave when an object/observer/source is in motion
What is the purpose of a half-life?
Its purpose is to determine how long it would take for an isotope to give off enough radiation in order for it to become somewhat stable
What is the potential difference in a circuit?
The voltage
What force causes the velocity to constantly change and why?
Centripetal force. This force goes in a circular motion, which causes the velocity to constantly change since the direction is always changing.
A truck that weighs 3,500 kg collides into a house on the side of the road after dropping down a hill at 32 m/s. After the collision, the truck comes at full stop after 0.24 seconds pass. What is the force applied by the house?
466,666 N
True or False: electromagnetic waves travel at different speeds since they have different wavelengths?
False. They all travel at the same speed regardless of their differences in wavelengths. The different wavelengths represent different colors.
A 130g sample of Francium-220 has a half life of about 27 seconds, approximately how much of the sample is left after a 2 minutes?
about 8.125 grams
How is current increased?
The net force is related to what factor of an object?
Acceleration
In order for the momentum to equal zero, what must the objects equal?
Both objects must have equal momenta, but in opposite directions