If an electromagnetic wave has its magnetic field oscillating in the vertical direction, the direction of oscillation of the electric field is

A)

east-west.
B)

horizontal.
C)

vertical.
D)

north-south.
E)

circular.


B

Physics & Space Science

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The lowest tone to resonate in an open pipe of length L is 400. Hz. What is the frequency of the lowest tone that will resonate in a closed pipe of length 2L?

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If the polarizing angle (the angle at which reflected light is completely plane polarized) of a flat piece of sapphire is 60.5°, what is its index of refraction?

a. 1.97 b. 1.77 c. 1.59 d. 2.36 e. 1.82

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The electrical force between electric charges depends only on their

A) magnitude. B) separation distance. C) both of these D) neither of these

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A metal having a work function of 2.8 eV is illuminated with monochromatic light whose photon energy is 3.9 eV. What is the threshold frequency for photoelectron production? (h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)

A) 7.6 × 1014 Hz B) 8.5 × 1014 Hz C) 2.7 × 1014 Hz D) 9.4 × 1014 Hz E) 6.8 × 1014 Hz

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