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A He-Ne laser produces light of wavelength 633 nm with intensity 1.09 103 W/m2, over a beam of cross-sectional area 1.04 mm2. How many photons per second are emitted by the laser?
________ photons/s
The concept of thermionic emission is the basis of modern X-ray tubes, which are the workhorse of a medical X-ray image. In this process a filament (a piece of metal in a vacuum) is heated by the application of electrical current.
Rare 1918 "Jenny" stamp, depicting a misprinted, upside-down Curtiss JN-4 "Jenny" airplane, was sold at auction for $525,000. A collector uses a simple magnifiying glass to examine the "Jenny," obtaining a linear magnification of 2.4 when the stam..
A massless spring of force constant 19 N/m hangs vertically. A body of mass 0.20-kg is attached to its free end and then released. find the amplitude of the resulting motion
A high-speed flywheel in a motor is spinning at 450 rpm when a power failure suddenly occurs. The flywheel has mass 37.0kg and diameter 71 cm. The power is off for 27.0s and during this time the flywheel slows due to friction in its axle bearings...
A sample containing sulfur (atomic mass 32 u), manganese (55 u), and an unknown element is placed in a mass spectrometer. What is the mass of the unknown element
a ray of light traveling through one type of glass, In which type of glass does light travel at a higher speed
A lens is formed from a plastic material that has an index of refraction of 1.55. If the radius of curvature of one surface is 1.25 m, calculate the focal length and the power of the lens.
Vertically polarized light with an intensity of 0.40 W/m2 passes through a polarizer whose transmission axis is at an angle of 55 degrees with the vertical
An inductor with an inductance of 2.90H and a resistor with a resistance of 6.00? are connected to the terminals of a battery with an emf of 4.00V, Find the initial potential difference across the inductor
Some amusement park rides move you back and forth in the horizontal direction. Why is this motion so much more disturbing to your body than cruising at a high speed in a jet airplane.
A baseball is hit at 30.0 m/s at an angle of 53.00 above the horizontal. What was the original distance between the outfielder and the batter
The blades of a fan running at low speed turn at 260rpm . When the fan is switched to high speed, the rotation rate increases uniformly to 360rpm in 5.65s.
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