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(a) You're using a 20-cm-focal-length convex lens to image a small light bulb. Where should you place the bulb to get a half-size real image? (b) A movie projector uses a single lens to project a real image on a screen 6 m from the lens. Each frame of the movie film is 3 cm tall, and the image is 1.2 m tall. How far should the film be from the lens?
Sketch the potential energy or EC and EV as a function of position in a semiconductor crystal which contains a complete random distribution of a small fraction of the host atoms from their lattice sites.
If the received power at a reference distance d0 = 1 km is equal to 1 microwatt, find the received powers at distances of 2 km, 5 km, 10 km, and 20 km from the same transmitter for the following path loss models:
Light with a frequency of 5.3×1014 Hz is travelling through glass and strikes a glass/air interface as shown above. Angle X1 is 26.0o to the normal. What is the wavelength of this light in the glass
q1. an object hangs from a spring balance. the balance indicates 40 n in air and 30 n when the object is submerged in
In a Hall-effect experiment, a current of 2.9 A sent lengthwise through a conductor 0.89 cm wide, 3.1 cm long,, find the drift speed (in m/s) of the charge carriers
In a certain time period a coil of wire is rotated from one orientation to another regarding a uniform 0.38-T magnetic field. The emf induced in the coil is 3.5 V. Other things being equal, what will the induced emf be if the field had a magnitude..
The Pfund series results from emission/absorption of photons due to transitions of electrons in a hydrogen to/from the n = 5 energy level from/to higher energy levels
the current is an inductor is .10 A and the frequency is 750 hz. if the inductance is .080 H what is the voltage across the inductor
The distance from the earth to the center of our galaxy is about 23000ly(1yr is 9.47x10^15m), as measured by an earth based observer. how long will it take to make the trip
the planet neptune is 4.5 x1012m from the earth. its diameter is 4.9 x 107m. what diameter telescope objective would be
A certain substance has a dielectric constant of 2.8 and a dielectric strength of 18.0 MV/m. If it is used as the dielectric material in a parallel-plate capacitor, what minimum area should the plates of the capacitor have to obtain a capacitance of ..
Two negative point charges are separated by 13 centimeter and feel a mutual repulsive force of 2.60 N. Determine how much charge does each have in µC
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