A negative value for the magnification of a lens-object combination indicates
A. The image is larger than the object.
B. The image is smaller than the object
C. The image is upright relative to the object.
D. The image is inverted relative to the object. It depends on the lens.
Ans: D. The image is inverted relative to the object. It depends on the lens.
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A crystal diffracts a beam of electrons, like a diffraction grating, as they hit it perpendicular to its surface
The crystal spacing is 0.18 nm, and the first maximum scattering occurs at 80° relative to the normal to the surface. (e = 1.60 × 10-19 C, melectron = 9.11 × 10-13 kg, h = 6.626 × 10-34 J ? s) (a) What is the wavelength of the electrons? (b) What potential difference accelerated the electrons if they started from rest?
A 6.0 cm tall object is placed 20 cm in front of a convex mirror with focal -100 cm focal length. Where is the image formed?
A. 80 cm behind the mirror B. 25 cm behind the mirror C. 17 cm behind the mirror D. 17 cm in front of the mirror E. 25 cm in front of the mirror
A filtergram is a photograph of the sun's surface made
a. in a band of wavelengths in the infrared. b. in a band of wavelengths in the ultraviolet. c. using the Zeeman effect. d. with only those photons emitted in a specific spectral line. e. none of the above
Radioactive Decay: One material used in nuclear bombs is 239Pu, with a half-life of 24,000 years. How long must we wait for a buried stockpile of this substance to decay to 1/1000 of its original activity?
A. 1,200,000 years B. 240,000 years C. 150,000 years D. 82,000 years E. 1500 years