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Platinum has a work purpose of 6.4 eV. Radiation by wavelength 150 nm and intensity 1.3 W/m2 is directed at a platinum surface. (a) Discover the maximum kinetic energy of the ejected electrons. (b) If 1.0% of the photons striking a1.0 cm2 area of platinum eject electrons, how many electrons are emitted per second from that part of the surface?
a student m 97 kg runs at a velocity vi 2.85 ms before jumping on a skateboard. after jumping on the board the
A block of ice of mass 100 g and at 00 C is dropped into 500 g of water at 800 C in a Styrofoam cup. describe the process of each heat loss or gain
Four point charges have the same magnitude of 2.2 x10-12 C and are fixed to the corners of a square that is8.3 cm on a side. Three of the charges are positive and one isnegative. Determine the magnitude of the net electric field that exists at the..
A back-reflection Laue pattern is made of an aluminum crystal at 50 kv. What orders of reflection are present in the beam diffracted by these planes
how long does it take for a person to radiate. Calculate the time of flight.
total electric charges q are distributed uniformly onver the half spherical shell. Calculate the electric field at the center o of the sphere
A car is moving on a flat horizontal circular track of radius 120 m. The speed of the car is constant, 15m/s. The mass of the car is 1200 kg. Ignore air resistance. What force is keeping the car in the circle?
a u.s $20 gold piece has a mass of 33.44g and displaces 1.935cm^3 of water. if the coin is known to consist of only gold, what is the percentage of gold composition by mass of the coin
You are in a hot air balloon (yes, another balloon problem!) rising from the ground at a constant velocity of 2.70 m/s upward. How long does the cork remain in the air
micircraquodacircmiddotsinicirccedilmwhere icircraquo is the wavelength of the spectral line being observed d is the
In an LC circuit in which C = 4.0?F the maximum potential difference across tha capacitor during the oscillations is 1.5V and the maximum current through the inductor is 50 mA.
1 mole of an ideal gas initially at 100° C and 1 atm is expanded adiabatically against a constant pressure of 5 atm until equilibrium is re-established. Given that the temperature dependence of the heat capacity is CV = 4.50 + 0.005T calculate ?U,..
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