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A light-emitting diode (LED) connected to a 3.0 V power supply emits 440 nm blue light. The current in the LED is 21 mA , and the LED is 71 % efficient at converting electric power input into light power output. How many photons per second does the LED emit?
Red light of wavelength 633nm from a helium-neon laser passes through a slit 0.350mm wide. The diffraction pattern is observed on a screen 3.50m away. What is the width of the central bright fringe
A mass is stretched 4 centimeters from the equilibrium position of a spring. If the displacement is doubled, what can be concluded about the restoring force? A. It is halved. B. It is doubled. C. It stays the same. D. It is increased by 4. E. It i..
A prism is made from a certain type of glass, and has a cross section shaped like an equilateral triangle. The indices of refraction for the red and violet light in this type of glass are 1.646 and 1.680, respectively. The angle of incidence for both..
An oxygen ion O2 is a distance r = 4.5 x 10-10 m from a H+ ion. How much energy is required to separate them completely
A 1.98 10-9 C charge has coordinates x = 0, y = ?2.00; a 2.73 10-9 C charge has coordinates x = 3.00, y = 0; and a -4.95 10-9 C charge has coordinates x = 3.00, y = 4.00, where all distances are in cm.
A total Charge of 0.696uC is distributed uniformly throughout an entire region, giving a charge per volume of 348uC/m3. A Gaussian surface encloses 0.174uC of that charge. What is the volume of that entire region?
A 10 m long wire carrying a current of 22 A makes an angle of 37 degrees with the Earth's magnetic field of 0.51 mT. What is the magnetic force of the wire
A car has a mass of 1000 kilogram it's at the top of a 10o hill. Find what is it gravitational potential energy relative to the bottom of the hill
Blood is flowing through an artery of radius 1.9 mm at a rate of 35.0 cm/s. Determine the flow rate and the volume that passes through the artery in a period of 20 s
A cylinder with a moveable piston holds 2.71 mol ofargon at a constant temperature of 307 K. Calculate the heat added to the gas
A block of unknown mass, m, is brought into the configuration shown. It was measured that upon release the block shot upward a maximum distance of 2m. Calculate the mass of this block? The upper spring has a natural length of 1m, and the lower spr..
What is the significance about the bell shape, when its hit at the rim it rings/produces sound better than other shaped objects? If so could anyone explain a little bit on it?
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