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1) The walls of a blackbody cavity are at a temperature of 27o C. What is the frequency of the radiation of maximum intensity? 2) Assume that a 100 - W light bulb gives off 2.50% of its energy as visible light. How many photons of visible light are given off in 1.00 min? (Use an average visible wavelength of 550 nm) 3) What is the energy of photons (joules) emitted by an 107.5-MHz FM radio station? 4) What is the longest wavelength of light that will emit electrons from a metal whose work function is 3.50 eV? 5) A metal with a work function of 2.40 eV is illuminated by a beam of monochromatic light. If the stopping potential is 2.5V, what is the wavelength of the light? 6) What is the de Broglie wavelength of a 1000 kg car moving at a velocity of 25 m/s? 7) A hydrogen atom in its ground state is excited to the n = 5 level. It then makes a transition directly to the n = 2 level before returning to the ground state.
a) What are the wavelengths of the emitted photons?
b) Would any of the emitted wavelengths be in the visible region? 8) What is the longest wavelength light capable of ionizing a hydrogen atom in the ground state?
A woman holds a tube of lipstick 8 cm from a spherical mirror and notices that the image of the tube is upright and one third its normal size. find what is the position of the image
A 1000 kg race car makes three and half laps around a circular race track with a 400m radius in 180 sec at a constant speed. determine the car's linear speed
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.90 m/s at an angle of 23.0° below the horizontal. Find the height from which the ball was thrown
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two point charges are fixed on the y axis a negative point charge q1 -27 microc at y1 0.21 m and a positive point
Suppose in the drawing that I1 =I2 = 23.6 A and that the separation between thewires is 0.0467 m. By applying an external magnetic field (createdby a source other than the wires) it is possible to cancel themutual repulsion of the wires. This exte..
An object is placed in front of a converging lens in such a position that the lens (f = 16.0 cm) creates a real image located 27.0 cm from the lens. Then, with the object remaining in place, the lens is replaced with another converging lens (f = 18.0..
Biological muscle cells can be thought of as nanomotors that use the chemical energy of ATP to produce mechanical work. How much work is done by such proteins
How many grams of gasoline are required to impart a velocity of 26 meters/sec (60 miles per hour) using the same engine and neglecting losses that may be higher at the higher velocity
an explosion breaks an object into two pieces one of which has 1.5 times the mass of the other. if 7400 j were released
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