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an led is constructed from a pn-junction based on a certain ga-as-p semiconducting material whose energy gap is 19 ev
a rocket passes earth and travels to a star 80 light-years away the earth hand the star are in the same frame of
an energy storage system based on a flywheel a rotating disk can store a maximum of 40 mj when the flywheel is rotating
consider the following two events a concert begins in miami florida and 5 seconds later according to a clock at rest on
a small disk of radius r200 cm has been glued to the edge of a larger disk of radius r900 cm so that the disks lie in
a turntable rotates with a constant angular acceleration 220rads2 after a time interval 440s the wheel has rotated
in a grocery store a convex mirror with r 40 m is used for surveillance suppose a person of height 17 m is 12 m from
two point charges 318 microc and -550 microc are separated by 122 m what is the electric potential midway between
a fly appears to be upside down and 3 times its actual size when viewed through a converging lens with a focal length
a ball whose diameter is 6 cm is placed 70 cm in front of a convex spherical mirror if the focal length of the mirror
two parallel plates have a capacitance of 10 microf when they are 10 mm apart the plates are then fully charged by a 90
a 20 kg box of running shoes slides on a horizontal frictionless table and collides with a 10 kg box of ballet slippers
a thin film of alcohol n136 lies on a flat glass plate n151 when monochromatic light whose wavelength can be changed is
ground beef may be irradiated with high-energy electrons from a linear accelerator to kill pathogens in a standard
we know from experience that the doppler shift of sound from a moving car is easily detectable assuming light with a
a point source of sound that emits uniformly in all directions is located in the middle of a large open field the
find the minimum frequency a photon must have if it is to ionize the n 1 state of a doubly ionized lithium
two point masses m1 2 kg and m2 1 kg are connected by a thin massless rod of length l 2 m and are freely rotating in
a 55 kg person is at rest at the left end of a floating 180kg log it starts to run toward the other end with a velocity
white light with frequencies ranging from to is incident on a potassium surface the work function of potassium is 224
a at what angle should the axes of two polaroids be placed so as to reduce the intensity of the incident unpolarized
a 57 kg block attached to a spring executes simple harmonic motion on a frictionless horizontal surface at time t0s the
a light bulb has a resistance of 260 it is connected to a standard wall socket 120 v rms 600 hza determine the rms
a cannon tilted up at a 30deg angle fires a cannon ball at 65 ms from atop a 12 m high fortress wall what is the balls
a ray of light is incident on a flat mirror at an angle if we then rotate the mirror by 10deg while keeping the