The variation in the pressure of helium gas, measured from its equilibrium value, is given by DP = 2.9 × 10^-5 cos (6.20x - 3 000t) where x and t have units m and s, and DP is measured in N/m2 . Determine the frequency (in Hz) of the wave
a. 1 500
b. 477
c. 1.01
d. 0.32
e. 239
B
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Magnifying Glass With the Image at the Near Point of the Eye: Consider a magnifying glass with a power of 3.0 diopters.(a) What is the maximum angular magnification for a person with a near point at 25 cm?(b) What is the angular magnification when viewing with a relaxed eye?
Fill in the blank(s) with the appropriate word(s).
An object more massive than the Sun, but roughly the size of a city, is a
A) supernova remnant. B) white dwarf. C) brown dwarf. D) neutron star. E) red dwarf.
Consider point charges of +Q and +4Q, which are separated by 3 m. At what point, on a line between the two charges, would it be possible to place a charge of -Q such that the electrostatic force acting on it would be zero?
A) 3/5 m from the +Q charge B) 1 m from the +Q charge C) 1 m from the +4 charge D) 3 m from the +4 charge E) There is no such point possible.
The focal lengths of the objective and the eyepiece of a microscope are 0.5 cm and 2.0 cm, respectively, and their separation adjusted for minimum eyestrain is 6.0 cm. The near-point distance of the person using the microscope is 25.0 cm
If the microscope is focused on a small object, what is its final magnification? A) -44 B) -66 C) -77 D) -88 E) -100