Physics Questions
Explore questions in the Physics category that you can ask Spark.E!
A ray of green light travels through air and is refracted as it enters a glass prism shown in the figure. An unknown liquid is in contact with the right side of the prism. The light then follows the path shown. Which one of the following statements concerning this situation is true? Image9.gif The frequency of the light changes inside the prism. The index of refraction of the glass is smaller than that of air. The index of refraction of the unknown liquid is the same as that of the glass. The speed of light is larger in the liquid than in the glass. The refractive index of the liquid is the same as that of air.
An object is placed in front of a concave spherical mirror as shown below. F denotes the focal point and C the center of curvature. What is true about the properties of the image?Image4.jpg real, upright, enlarged real, inverted, reduced real, inverted, enlarged virtual, upright, enlarged virtual, inverted, reduced
The x marks the focal point of the lens below. Where will we find the image?Image8.jpg B A C D
Suppose that a pane of crown glass, with a refractive index of 1.52, is immersed in water, which has a refractive index of 1.33. A ray of light traveling in the water strikes the glass at 45° relative to the normal and travels through the pane. What angle, relative to the normal, will the ray of light subtend when it leaves the pane and reenters the water? 38° 54° 32° 45° No angle at all! The premise is wrong. The light will never enter the glass. It will be reflected when it strikes the glass surface.
Unpolarized light is incident on a linear polarizer. What fraction of the light is transmitted? 100% 50% 0% It depends on the orientation of the polarizer's transmission axis.
Electromagnetic waves emitted from the wiring in your house due to AC currents oscillating with a frequency of 60 Hz have a wavelength of about 5*10^-2 m. 5*10^-10 m. 5*10^3 m. 5*10^6 m.
Three polarizing disks, the planes of which are parallel, are centered on a common axis. The direction of the transmission axis in each case is shown in the figure above. A plane polarized beam of light with E0 parallel to the vertical reference direction is incident from the left on the first disk with intensity Ii = 10 units (arbitrary). What is the transmitted intensity If when θ1 = 20 degrees, θ2 = 40 degrees and θ3 = 60 degrees?pol1.gif 9.4 8.83 8.3 6.89 3.6 1.3
A radar unit sends out 0.05 microsecond pulses of microwaves whose wavelength is 25 mm. How many wavelengths does each pulse contain? Enter an integer.
In SI units, the electric field in an electromagnetic wave is described by Ey = 100 sin(107x - ωt ). What is the frequency of the EM wave in units of 1014 Hz? Enter a number with two digits behind the decimal point.
A generator coil is rotated through one-fourth of a revolution (from θ = 0º to θ = 90º) in 11 ms. The 237-turn circular coil has a 4.7 cm radius and is in a uniform 1.96 T magnetic field which initially is pointing along the normal of the coil. What is the magnitude of the average emf (in V) induced?Enter an integer
In astronomy, distances are often expressed in light years, the distance light travels in one year. Alpha Centauri, the closest star to earth, is 4.3 light years away. Express this distance in meters. 4.1*1016 m 9.5*1015 m 17.74*1010 m 1.36*108 m 1.29*109 m
The figure shows a conducting rod sliding over two bare wires. The wires are in a horizontal plane (ignore gravity) and are connected through the resistor R. A uniform magnetic field points out of the page everywhere. Friction between the rod and the wires is negligible. At the instant shown, the rod is moving from right to left, toward R, with a speed v. (A hand got the rod startedbefore the instant shown, but is no longer in contact with it.) Which one of the following is true at the instant shown?Image2.gif Current is flowing through R from a to b. Current is flowing through R from b to a There is no current flowing through R. An alternating current is flowing. The rod experiences no net force.
he current in an infinite solenoid with uniform magnetic field B inside pointing out of the screen is increasing so that the magnitude B in increasing with time. A circular loop of radius r is placed coaxially outside the solenoid as shown. Determine the direction of the field Bind created by the induced current in the loop, in the plane region inside the loop?Image3.gif Into the screen. Out of the screen. The induced B is zero. Clockwise.
how much mass do non-electrolytes make up in the plasma, ISF and the cell
how much water enters the body per day
what is the main driver of fluid movement in the body
what organ regulates ion concentrations in the plasma and ISF. What should it be maintained at?
what is the main cation and anion in INTRAcellular fluid
what is the main cation and anion in extracellular fluid
% of body water for healthy males