An object 15 cm high is placed 15 cm in front of a convex mirror with a focal length of ?10 cm. What is the image height (in cm)?
a. 2
b. 4
c. 6
d. 8
e. 30
c
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A certain crystal has an interatomic spacing of 0.442 nm. A beam of neutrons moving with a speed of 1640 m/s is diffracted from the crystal. What is the de Broglie wavelength of the neutron?
A) 0.121 nm B) 0 nm C) 0.241 nm D) 0.484 nm E) 0.682 nm
Suppose the interior angles of a triangle are ?1, ?2, and ?3, with ?1 > ?2 > ?3 . Which side of the triangle is the shortest?
a. The side opposite ?1 b. The side opposite ?2. c. The side opposite ?3 d. More information is needed unless the triangle is a right triangle.
Monochromatic light from a He-Ne laser (? = 632.8 nm) is incident on a diffraction grating containing 5000 lines/cm. Determine the angle of the first-order maximum
a. 18.4° b. 39.2° c. 14.6° d. 27.7° e. 13.9°
Which of the following types of radiation has the least ability to penetrate matter?
a. Alpha particles b. Gamma rays c. X-rays d. Beta particles