In which part of the electromagnetic spectrum have astronomers been unable to get any information?
A) Gamma rays
B) X-rays
C) Ultraviolet
D) Microwaves
E) We now can access information in all spectral lengths.
E
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What happens to an electron's wave packet if an accurate velocity measurement is performed?
A) It suddenly changes to a new wave packet having a very small uncertainty in position, but a large uncertainty in velocity. B) It suddenly changes to a new wave packet having a very small uncertainty in velocity, but a large uncertainty in position. C) It suddenly changes to a new wave packet having small uncertainties in both velocity and position. D) Neither the wave packet nor the electron is affected by the measurement. E) The wave packet is unaffected by the measurement, even though the electron itself makes a sudden change of state that is caused by the measurement.
Light of wavelength 519 nm passes through two slits. In the interference pattern on a screen 4.6 m away, adjacent bright fringes are separated by 5.2 mm in the general vicinity of the center of the pattern. What is the separation of the two slits?
What will be an ideal response?
By using a compass to measure the magnetic field direction at various points adjacent to a long straight wire, you can show that the wire's magnetic field lines are
a. straight lines in space that go from one magnetic charge to another. b. straight lines in space that are parallel to the wire. c. straight lines in space that are perpendicular to the wire. d. circles that have their centers on the wire and lie in planes perpendicular to the wire. e. circles that have the wire lying along a diameter of the circle.
An object drops in free fall. At one instant it is moving at a speed of 50 meters per second. Exactly one second later its speed is about
1) 10 m/s. 2) 50 m/s. 3) 60 m/s. 4) 100 m/s. This is because 5) no net force acts on the object while in its state of free fall. 6) it gains a speed of about 10 m/s for each second of fall. 7) its velocity nearly doubles each second.