Homework Statement
(a) What is the minimum energy (in electron volts) that is required to remove the electron from the ground state of an ionized atom (Z=2)? (b) What is the ionization energy for this ion?
Homework Equations
After doing what I got the answer for part (b)... but I don't...
Homework Statement
an electron is trapped in a sphere whose diameter is 52 x 10-15 m. What is the minimum uncertainty in the electron's momentum?
Homework Equations
I know that the uncertainty in the electron's position is equal to the diameter... but how do I set up the equation?The Attempt...
It DOES has to do with relativity because E0=mc^2 is the hint that the website (for this HW problem) gave to solve for the problem. It may not be the bulk of the problem but it is at least partially part of the process.
Also, how can i relate this problem to how a car engine works?
Homework Statement
Suppose one gallon of gasoline produces 1.1 x 10^8 J of energy, and this energy is sufficient to operate a car for twenty miles. If a 362 mg drop of gasoline could be converted completely into thermal energy, how many miles could the car go with that energy?
Homework...
Homework Statement
A mixture of red light (wavelength vacuum = 652 nm) and green light (wavelength vacuum = 477 nm) shines perpendicularly on a soap film (n = 1.333) that has air on either side. What is the minimum nonzero thickness of the film, so that destructive interference removes the...
Homework Statement
A speeder is pulling directly AWAY and INCREASING his distance from a police car that is moving at 27 m/s with respect to the ground. The radar gun in the police car emits an electromagnetic wave with a frequency of 7.2 x 109 Hz. The wave reflects from the speeder's car and...
Homework Statement
In the absence of a nearby metal object, the two inductances LA and LB in a heterodyne metal detector are the same, and the resonant frequencies of the two oscillator circuits have the same value of 430 kHz. When the search coil (inductor B) is brought near a buried metal...
Homework Statement
A light bulb has a resistance of 212 . It is connected to a standard wall socket (120 V, 60.0 Hz). (a) Determine the current in the bulb. (b) Determine the current in the bulb after a 13.2-μF capacitor is added in series in the circuit.
Homework Equations
R, V, f are...
Homework Statement
A long, straight, vertical segment of wire traverses a magnetic field of magnitude 2.0 T in the direction shown in the diagram. The length of the wire that lies in the magnetic field is 0.060 m. When the switch is closed, a current of 4.0 A flows through the wire from point...
Homework Statement
A charged particle is moving in a uniform, constant magnetic field. Which one of the following statements concerning the magnetic force exerted on the particle is false?
It changes the velocity of the particle.
It increases the speed of the particle.
It does not...
Homework Statement
A 60-W lamp is placed in series with a resistor and a 120-V source. If the voltage across the lamp is 35-V, what is the resistance (R) of the resistor?
Homework Equations
I am pretty sure I am using the right equation, but I am not getting the right answer. What am I...
Homework Statement
A light bulb is connected to a 120.0-V wall socket. The current in the bulb depends on the time t according to the relation I = (0.669 A) sin [(491 Hz)t].
What is the frequency of the alternating current?
Homework Equations
How do I use the given value for I...