The hydrogen Balmer line H? has a wavelength of 486.1 nm in the laboratory. It is observed in a quasar at 2430.5 nm. What is the change in wavelength (in nm) of this quasar? Is it a "redshift" or "blueshift"?
a. 0; no change
b. 2430.5; redshift
c. 486.1; blue shift
d. 1944.4; blueshift
e. 1944.4; redshift
e
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A 50-cm wire placed in an East-West direction is moved horizontally to the North with a speed of 2 m/s
The Horizontal and Vertical components of the earth's magnetic field at that location are 25 ?T and 50?T respectively. What is the emf between the ends of the wire? A) 30 ?V B) 10 ?V C) 20 ?V D) 40 ?V E) 50 ?V
What Einstein discovered about space and time is that they
A) are separate entities. B) are parts of one whole. C) follow an inverse-square law. D) are special to space travelers.
Holography was invented by
A. Max von Laue. B. Sir David Brewster. C. Rosalind Franklin. D. Dennis Gabor. E. Bill Gates.
A parallel plate capacitor of capacitance C0 has plates of area A with separation d between them. When it is connected to a battery of voltage V0, it has charge of magnitude Q0 on its plates. The plates are pulled apart to a separation 2d while the capacitor remains connected to the battery. After the plates are 2d apart, the magnitude of the charge on the plates and the potential difference between them are what?
A.
Q0, 
V0B.
Q0, V0C.
D.
E.