The mean free path of a molecule is m in an ideal gas at standard temperature and pressure. What is the mean free path when the diameter of the molecule is doubled?

A.

B.

C.

D.

E.


C.

Physics & Space Science

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A Compton scattering experiment is performed in which the scattered photons have a maximum energy of 17.2 keV. What was the incident energy of the photons used in this experiment?

A. 16.6 keV B. 18.5 keV C. 16.1 keV D. 17.8 keV

Physics & Space Science

An object is 20.0 cm from the surface of a spherical Christmas tree ornament that is 8.00 cm in diameter. What is the magnification of the image?

a. – 0.091 b. – 0.545 c. + 0.091 d. + 0.545 e. + 0.364

Physics & Space Science

A conducting loop in the form of a circle is placed perpendicular to a magnetic field of 0.50 T. If the area of the loop decreases at a rate of 3.0 × 10-3 m2 /s, what is the induced emf in the loop?

A) 1.7 mV B) 4.3 mV C) 5.5 mV D) 0 mV E) 1.5 mV

Physics & Space Science

An iceberg is floating in the ocean with 10% of its volume extending above the ocean's surface. What can you say about the iceberg?

A. As it melts, a smaller fraction of its volume will extend above the surface B. Its density is close to but smaller than the density of water C. It displaces only 90% of its weight in water D. Its weight is less than the water it displaces

Physics & Space Science