Physics Questions
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What determines the speed in which a wave travels?
Tesla measures field strength within the __________; Gauss measures the __________ around it
Solenoid is a helix (coil) of wire with a __________, increases flux density by __________
- (1) Malleus- (2) Malleus ligament- (3) Incus- (4) Incus ligament- (5) Stapes muscle (stapedius)- (6) Stapes footplate- (7) Eardrum- (8) Eustachian tube- (9) Malleus muscle (tensor tympani)- (10) Nerve (chorda tympani) sectioned
Lines of force always flow from __________ outside the magnet and from __________ within the magnet
Tesla is the unit of measure for __________ magnets
A conductor, magnetic field, and energy for motion between the two are the the
A 125 nm layer of oil (n=1.2) floats on a puddle of water (n=1.33). Reflected sunlight is observedfrom directly above. Which color (wavelength in vacuum) is reflected most brightly?a) 400 nmb) 450 nmc) 500 nmd) 550 nme) 600 nm
A ray of sunlight has an incident angle of 50° when it encounters a glass window with index ofrefraction n=1.5. There is air with index n=1 on both sides of the window and the window surfaces areparallel. Which statement below is true?a) The light is 100 percent reflected at the first interface.b) The light is 100 percent reflected at the second interface.c) Light emerges on the other side of the window traveling parallel to the incident ray.d) Light emerges on the other side of the window but different colors now travel in different directions.e) Light emerges on the other side and is now 100% polarized parallel to the window.
The current in a wire produces a field much stronger then the
Violet light of wavelength 400 nm in air is incident along a normal line to a plane of glass (n=1.50)that has a 120 nm thick transparent coating, with an index of refraction somewhere between 1.55 and2.0. There appears to be no reflected light to an observer above. What is the index of refraction of thecoating?a) 1.57b) 1.67c) 1.77d) 1.87e) 1.97
Which statement is true about Maxwell's equations?a) An electric field will always create (induce) a magnetic field in the surrounding space.b) A magnetic field will always create (induce) an electric field in the surrounding space.c) The speed of light in vacuum can be calculated directly from Maxwell's equations.d) The speed of light in vacuum can be calculated directly from Maxwell's equations but the color(wavelength) must also be known.e) More than one of the above statements are true.
A measure of the intensity of magnetization produced by a magnetic field, measured in
The oldest electromagnetic waves in the universe are referred to as Cosmic Background Radiation.This radiation permeates all of space nearly uniformly, and has an intensity versus wavelength curveidentical to matter at a temperature of 2.7 K (-270° Celsius). This radiation has an intensity peak inwhich portion of the EM spectrum?a) gamma rayb) x-rayc) ultravioletd) white lighte) microwave
Magnetic flux is a measure of the strength of a magnetic field over a given area, measured in
Rays of sunlight traveling in the y-z plane reflect off of a glass window which lies in the x-y plane.The reflected light may be partially polarized along which axis?a) x axisb) y axisc) z axisd) the reflected light must remain unpolarizede) the index of refraction of glass is needed to determine whether the reflected light is partiallypolarized or not
Monochromatic light traveling through medium 1 refracts when it enters medium 2. The incidentangle is 40° and the refracted angle is 32°. Compared to the frequency of light traveling throughmedium 1, the frequency of light traveling through medium 2 is:a) f2 = 0.8 f1b) f2 = f1c) f2 = 1.25 f1d) both indexes of refraction must be known in order to calculatee) none of the above answers are correct
It's observed that light traveling through flint glass has a critical angle of 43.6° when encounteringan interface with water (n=1.33). What is the index of refraction for flint glass?a) 1.98b) 1.93c) 1.88d) 1.83e) 1.78
A secondary rainbow occurs when sunlight refracts into a water droplet and then has two internalreflections before refracting back into the air. The sketch shows the paths of a red and violet ray oflight, but it's not given which is which, only that the index of refraction of water is slightly higher forviolet than it is for red. Which color appears along the inner radius of the secondary rainbow?a) redb) violetc) it may be either red or violet depending on which direction the secondary rainbow is viewed fromd) secondary rainbows lead to merely a pot of silver
Sunlight is incident on two ideal polarizers in series. The light that makes it past the 2nd polarizerhas 30 % of the intensity of the incident sunlight and the magnetic field of this wave oscillates along avertical axis. The 1st of the two polarizers has a polarization axis at what angle with respect to thehorizontal?a) 35 degreesb) 37 degreesc) 39 degreesd) 41 degreese) 43 degrees