In a single-slit experiment, the width of the slit is slowly decreased. The diffraction pattern
A. remains unchanged.
B. spreads out.
C. shrinks together.
D. fades away.
B. spreads out.
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The chromosphere of the sun has a higher temperature than the photosphere
Indicate whether the statement is true or false
Gravitational Potential Energy: In the past, Earth has been hit by many asteroids, some very large. Suppose one such asteroid approached Earth so that when it was very far away it was traveling at 6500 m/s along a line that would miss the center of Earth by 8,500,000 m. Because of the gravitational attraction of Earth, it departed from this straight line and curved towards Earth, colliding with it. What was the speed of this asteroid when it hit Earth if we ignore the effect of the sun? The mass of Earth is 5.97 × 1024 kg, its radius is 6.38 × 106 m, and G = 6.67 × 10-11 N ? m2/kg2.
A. 11,400 m/s B. 12,900 m/s C. 13,700 m/s D. 15,800 m/s E. 16,400 m/s
The largest effective telescope, created by radio interferometry, is the size of
A) several football fields, in a natural depression in Puerto Rico. B) tens of miles across, in the deserts of New Mexico. C) the state of New Mexico. D) the continental United States. E) Earth.
A raindrop is doing its part to form a primary rainbow. Red and blue light enter near the top of the raindrop together from the sun. Both red and blue are reflected once at the back surface of the drop, but when the two rays emerge on the sunward side
A. the red ray lies above the blue ray and is more nearly horizontal than the blue ray. B. the blue ray lies above the red ray and is more nearly horizontal than the red ray. C. the blue ray lies below the yellow ray and is more nearly horizontal than the yellow ray. D. None of these choices are correct