A proton, moving freely, has a wavelength of 0.600 pm
(a) What is its momentum?
(b) What is its speed?
(c) Through what potential difference might it have been accelerated through, from rest, to reach this speed?
(a) 1.10 × 10-21 N-s
(b) 0.660 × 106 m/s
(c) 2.28 KV
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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
Which of the following is not evidence for dark matter?
A) the flat rotation curves of spiral galaxies B) x-ray observations of hot gas in galaxy clusters C) gravitational lensing around galaxy clusters D) the expansion of the universe
To explain retrograde motion as well as changes in planetary brightness, Ptolemy's model used ________
Fill in the blank(s) with correct word
Which of the following would decrease the magnification of a compound microscope?
a. Replacing the objective lens with one of larger diameter. b. Replacing the eyepiece lens with one of shorter focal length. c. Replacing the eyepiece lens with one of smaller diameter. d. Replacing the objective lens with one of longer focal length.