The wavelength of a certain portion of microwaves is 40 mm. What is its frequency?
A) 40 GHz
B) 4.0 GHz
C) 0.75 GHz
D) 75 GHz
E) 7.5 GHz
E
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Thin Films: Light in a frozen block of ice reflects off the ice-air interface at the surface of the block. What phase shift does it undergo?
A. 0° B. 90° C. 180° D. 270° E. It does not undergo any phase shift.
Which of the following statements about the accelerations and gravitational forces between a planet and a star is true?
A) Accelerations and forces are both equal and opposite. B) Forces are equal and opposite; the star is accelerated more than the planet. C) Acceleration is equal and opposite; the planet feels more force more than the star. D) Acceleration is equal and opposite; the star feels more force more than the planet. E) Forces are equal and opposite; the planet is accelerated more than the star.
The spectra of the coolest stars contain strong absorption features (or lines) of
a. TiO molecules.
b. ionized helium.
c. helium.
d. hydrogen.
e. All of the other choices are correct.
Which point is nearest the x-axis?
a. (1, 7) b. (–3, –6) c. (–7, 5) d. (–6, –4) e. (2, 3)