A single slit of width a is illuminated by light of wavelength l. If a = 4.3l, the maximum number of dark fringes on a semi-circular screen surrounding the slit is
a. 2.
b. 4.
c. 6.
d. 8.
e. 9.
D
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A mercury thermometer has a bulb of volume 0.100 cm3 at 10.°C. The capillary tube above the bulb has a cross-sectional area of 0.012 mm2
The volume thermal expansion coefficient of mercury is 1.80 × 10-4 K-1. How much will the mercury rise when the temperature rises to 30.°C?
A 10-kg block is pushed across a friction-free horizontal surface with a horizontal force of 20 N. The acceleration of the block is
A) 1 m/s2. B) 2 m/s2. C) 5 m/s2. D) 10 m/s2. E) none of the above
A 50-kg satellite circles the Earth in an orbit with a period of 120 min. What minimum energy is required to change the orbit to another circular orbit with a period of 180 min? (Earth: radius = 6.4 × 10^6 m, mass = 6.0 × 10^24 kg)
a. 2.9 × 10^8 J b. 3.5 × 10^8 J c. 4.1 × 10^8 J d. 4.7 × 10^8 J e. 5.9 × 10^8 J
Blue light travels more slowly through glass than red light does
Indicate whether the statement is true or false