Atomic Fun
Atoms become charged by gaining or losing ____________.
Electrons
Which of the following quantities would be considered a vector?
a. electric charge b. electric energy c. electric field
c. electric field
What is the formula for calculating the energy of a photon? Use the full words, not just the letters, when describing the terms in the equation.
Energy of a photon equals Planck's constant multiplied by frequency.
For resisters in series, the equivalent total resistance is _______________ of their values.
a. less than the sum b. greater then the sum c. the same as the sum
c. the same as the sum
Solve for the field strength, E, experienced by a test charge, q, if the charge is 6.5 x 10-5 coulombs and the force is 7.2 N.
1.1 x 105
E=F/q
If an object has a deficiency of electrons, what is its charge?
Positive
The resistance of a conductor depends on length, resistivity and ______________.
cross-sectional area
One watt is equivalent to how many Joules per sec (J/s)?
one
When you turn on a light switch in a room, you have completed a ___________ circuit.
parallel
What is the current(I) if a 9.0 V battery is placed across a 2.5 ohm resistance(R)?
3.6 amps
When comparing gravitational force and electrical force between 2 protons, which would have a stronger force?
the electrical force
True or False
A magnetic field interacts with stationary electric charges.
False
If the energy of an x-ray was 1.99 x 10-17 J, what would that be in electron volts (eV)?
124 eV
The lights in your home operate from 110 V. If a 100W and 75W bulb are used, which bulb has the greater current?
100W bulb
Calculate the capacitance (C), when the capacitor has a charge of 0.002 coulombs connected across a 10 volt battery. Calculate the answer to be in microfarads (uf). (1 farad = 1,000,000 uf)
200 uf
Ernest Rutherford is known for his work with the gold foil experiment and the discovery of the ___________.
proton
In an analogy between water and electric current; water would correspond to the charge, and the actual flow of water would correspond to _____________.
current
A visible red light has a wavelength of 7.00 x 10-7 m. Calculate the frequency.
4.29 x 1014
If a 3 ohm, 6 ohm and 15 ohm resistors are connected in parallel, which resistor would have the most current in it?
The 3 ohm resistor.
The resister with the least resistance will carry more current, in a parallel circuit.
Find the conductivity of a conduit with a length (L) of 25cm, a cross-sectional area (A) of 0.50cm2, given that its conductance (G) is 0.070 ohm-1.
3.5 ohm-1cm-1
Calcium has an atomic number of 20 (Z=20). How many electrons would be in its 3rd energy shell (n=3)?
10
A ____________ can increase or decrease voltage in a power line.
transformer
An A.M. radio station transmits at 575 kilohertz (kHz). Calculate the energy of a single photon at that frequency. Remember, you need to use hertz (Hz) in the formula!
3.81 x 10-28 J/photon
A series circuit has 2 resisters connected with a 12 V battery. Given R1 is 6.0 ohms and R2 is 4.0 ohms, calculate the current.
1.2 amps
The half life of an element is 20 minutes. If we start out with 400 grams, how much will we have left after 60 minutes?
50 grams
(3 half-lives, or 1/8th of original sample)