Physics Wave Optics Level: Misc Level
Information is encoded on an electromagnetic wave by modulating the amplitude. As the wave propagates through a dispersive medium, is the velocity of the information given by the group velocity, phase velocity or the speed of light?Does it matter if the information is digital or analogue?
Physics Wave Optics Level: Misc Level
A pulse of light has a gaussian shape in timewith a bandwidth of 3 GHz centered at a wavelength of =1.55 um.Does this pulse travel through a block of glass with a velocity determined by :a) the group velocity , b) the phase velocity, or c) the speed of light in vacuum? Explain how?
Physics Measurements Level: Misc Level
A few years ago, Cadillac announced the use red LEDs( wavelength~ 680 nm) instead of conventional bulbs with filaments for brake lights.The manufacturer claimed that because of their faster turn-on time, the stopping distance of a car following this new Cadillac could be reduced by up to 17 feet at 60 miles/hour. If this is so , what is the difference in the turn on time between the LED and the incandescent bulb that it replaced?
Physics Wave Optics Level: Misc Level
How far does a plane wave with a free space wavelength of 980 nm travel in one nanosecond in a material with an index of refraction of 1.5?
Physics Waves And Oscillations Level: Misc Level
The intensity of sound at a given point is measured to be 0.0005 w/m2. What is the decibel level of the sound?
Physics Properties Of Matter Level: Misc Level
The bulk modulus of a gas varies with pressure in the case of the air the bulk modulus of air is equal to 1.40 times its pressure. The atmospheric pressure at sea level is 1.01x10(to the power of 5) N/m2. The density of air at sea level is 1.20 kg/m2 for these conditions. What is the speed of sound as it passes through the air?
Physics Waves And Oscillations Level: Misc Level
When the Amplitude of a pendulum decreases to half it initial value, the period will have
a) halved
b) remained the same
c)doubled
Physics Wave Optics Level: Misc Level
What a visible object is receding, its color will....
a) Shift toward the red end of the spectrum.
b) Shift toward the blue end of the spectrum.
c) Not change in the slightest.
Physics Gravitation Level: Misc Level
A pendulum of length 2 meter is taken to a moon. If this pendulum makes 10 oscillations in 32.0 seconds, what is the value of gravitational acceleration on this moon?
Physics Properties Of Matter Level: Misc Level
What force must be applied to a small cylinder piston with a diameter of 0.32 m to lift a car weighing 12000N that is supported by the piston in a large cylinder that has a diameter of 1.4 m?Assume that there is an enclosed chamber in common between the two pistons and that the chamber is filled with hydraulic oil.
Physics Properties Of Matter Level: Misc Level
During level airplane flight at a constant velocity the pressure created by air flowing over the curved upper surface of the wing compared to the pressured created by air flowing along the flat underside of the wing is
a) more
b) less
c) insufficient data
d) the same
Physics Properties Of Matter Level: Misc Level
What is the height in cm of the column of mercury for a mercury barometer when the atmospheric pressure at a certain location in 1.00 atm? The density of mercury is 13.55 g/cm 3
Physics Force & Laws Of Motion Level: Misc Level
A spherical- shaped hollow steel shell, with a radius of 2.5 m, containing some instruments, is lowered by a cable into a lake.The shell with it contents weighs 7.2x10 (to the power of 5) N on the deck of the ship from which it is being lowered. What is the tension in the cable when the sphere is completely immersed in the water?
Physics Rotational Mechanics Level: Misc Level
A diver can change her rate of rotation in the air by tucking her head in and bending her knees.Let,s assume that when she is stretched out straight she is rotating at 1 revolution per second. Now she goes in the tuck and bends effectivly shortening the length of her body half. What will her rate of rotation be now?
a) 5 hz
b)4 hz
Physics Rotational Mechanics Level: Misc Level
A hoop of radius 0.5 m and a mass of 0.2 kg is released from rest 5 meters above the horizontal and allowed to roll down an inclined plane.How fast is it moving when it is 2 meters above the horizontal
a) 5.4 m/s
b) 3.8 m/s
c) 7.7 m/s
d) 2.2 m/s
