Is this a photo of a spiral galaxy or an elliptical galaxy, and how do you know?
A) It is a spiral galaxy because we can see a dusty disk going across the center.
B) It is a spiral galaxy, and we know because photos of this same galaxy from above show its spiral arms.
C) It is an elliptical galaxy because it is elliptical in shape.
D) It is an elliptical galaxy because it looks red/yellow in color.
A) It is a spiral galaxy because we can see a dusty disk going across the center.
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A metal having a work function of 2.5 eV is illuminated with white light that has a continuous wavelength band from 400 nm to 700 nm
For which one of the following ranges of the wavelength band in this white light are photoelectrons NOT produced? (h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J) A) 500 nm to 700 nm B) 400 nm to 560 nm C) 500 nm to 560 nm D) 400 nm to 500 nm E) 560 nm to 700 nm
What kind of light can be detected from an airplane but not from the ground?
A) most infrared light B) only the shortest-wavelength infrared light C) radio waves D) x-rays
A pinhole cameras has no lens. The tiny pin-hole opening insures that rays of light from different parts of an object
1) overlap. 2) don't overlap. 3) bend to a focus. Small openings between leaves in a tree act as pinholes. The round spots of light cast on the ground below are images of 4) the Sun. 5) the openings themselves. 6) both of these 7) neither of these
The wavelength of a periodic wave is 0.750 m. If the frequency is 425 Hz, then what is the velocity of the wave?
A. 210 m/s B. 276 m/s C. 319 m/s D. 410 m/s E. 472 m/s