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Which is more difficult: removing the valence electron from Potassium or removing the valence electron from sodium after the latter has been excited to the 4s level? Why?
If barium needs a minimum frequency of 6.07x10^14 s-1 to eject electrons, calculate the kinetic energy of the electron emitted when barium is illuminated with a wavelength of 385 nm.
What are the differences between alkenes and alkynes? What are the differences between cis- and trans-isomers? How are cistrans isomers used for night vision?
What is the wavelength (in nm) of radiation that has an energy content of 1.81X10^3 kJ/mol? In which region of the elctromagnetic spectrum is this radiation found?
A ruby laser produces radiation of wavelength 633 nm in pulses with a duration of 1.00*10^-9s. If the laser produces 0.475 J of energy per pulse, how many photons are produced in each pulse?
At 445 ºC calculate the equilibrium concentration of HI when 0.500 M HI, 0.0200 M H2, and 0.0200 M I2 are placed in a sealed flask and allowed to reach equilibrium. Kc for this reaction is 50 a
The entropy increase after mixing 2 moles of oxygen 1 mole of nitrogen, which were prepared at the same pressure and temperature, is (in J/K). (Pretend oxygen and nitrogen are ideal gases)
During a lightning flash, 18 C. of charge moves through a potential difference of 8.4E+07 V. How much electrical potential energy is released?
Describing the tribe's history after contact, including major events and armed conflicts that may have been important to the history of the tribe in the present day.
A particle P with mass 9kg has position vector r(r=2.5m) and velocity v(v=45.0 m/s). It is acted on by force F (F=10.0 N). All three vectors lie in the xy plane. About the origin, what is the z-comp
Due to heat sources (e.g. radioactivity) and remnant heat associated with Earth's accretion and differentiation. Why haven't the oceans boiled away as a result of the heat emanating from Earth's int
Is a transformer has 100 primary turns and 200 secondary turns. What is the current in the secondary coil if the primary coil has 10 A current?
What is the maximum torque on a coil with a magnetic moment of 5.6 A.m^2, when it is placed at an angle of 90 degrees relative to a magnetic field where B= 0.15 T?
The eccentricity of Earth's orbit is currently 0.0169. If the semi-major axis of the orbit is a = 149,598,261 km, calculate how big the semi-minor axis b is. How stretched out is the orbit, i.e.
Question: In a plane radio wave the maximum value of the electric field component is 5.86 V/m. Calculate (a) the maximum value of the magnetic field component and (b) the wave intensity.
If the oceans cover 70% of Earth's surface, how much heat in total is leaving the Earth's interior every second and entering the oceans?
Neglect air resistance and determine the kinetic energy of the ball at its highest point.
Below is an example of a simple household circuit with 3 identical bulbs with resistance of 100 O each. Assume that this is the standard household 120 V circuit. What is the current running through
Two spherical drops of water each carry a charge of 3.00E-11 C. and a potential of 430 V. at their surface. If the two drops combine to form a single spherical drop, what is the potential (in volts)
Consider a system of two balls in freefall (neglect drag). One ball has a mass of 5kg and the other of 7kg. What is the value of the time derivative of the system's total momentum at any time during
On a frozen pond, a 10kg sled is given a kick that imparts to it an intial speed of v0 = 2.0m/s. The coefficient of the kinetic friction between sled and ice is Mk = 0.10. Use the work-energy theore
A 1.3-nF capacitor charged to 90.0 V and a 7.5-nF capacitor charged to 40.0 V are connected with the negative plate of each connected to the negative plate of the other. What is the final charge on
Use the energy conservation to find the distance the block slides before coming to rest.
The note "middle C" on a piano has a frequency of 512 Hz in the fundamental tone. Suppose that the string that produces this note has a mass of 50g and a length of 10cm between its fixed ends. What
A description of a land feature anywhere on Earth that has been sculpted by physical and chemical weathering processes