When the slit width is doubled, what happens to the width of the central maximum in the diffraction pattern?
A. nothing
B. it doubles
C. it halves
D. it quadruples
E. it quarters
C. it halves
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Which of the following planets can be seen as a crescent phase from Earth?
a. Mercury b. Venus c. Mars d. Mercury and Venus e. All of the other choices are correct.
The acceleration of gravity on Earth's surface is 9.8 m/s2. What is the acceleration of gravity at a height of 6,400 km above Earth's surface? (Hint: recall the 1/r2 dependence and note that Earth's radius is 6,400 km.)
A. 19.6 m/s2 B. 2.45 m/s2 C. 9.8 m/s2 D. 4.9 m/s2
A concave mirror has a focal length of 20 cm. What is the magnification if the object's distance is 100 cm?
a. 1/2 b. 1/4 c. ?2 d. 4 e. ?1/4
Two long parallel wires are separated by 2.0 cm. The current in one of the wires is three times the other current. If the magnitude of the force on a 2.0-m length of one of the wires is equal to 60 mN, what is the greater of the two currents?
a. 2.0 A b. 1.0 A c. 3.0 A d. 9.0 A e. 1.5 A