A lens is used as a magnifier. Which of the following statements is incorrect?
a. The lens is convex.
b. The dioptric power of the lens is positive.
c. The magnification is greatest when the eye focuses at the near point.
d. The focal length of the lens must be negative.
d
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A. +x direction B. -x direction C. +y direction D. -y direction E. +z direction F. -z direction T. The field is zero.
If the speed of an electron increases, its de Broglie wavelength
a. increases c. stays the same b. decreases d. may increase or decrease
A rocket, initially at rest, is fired vertically with an upward acceleration of 10 m/s2 . At an altitude of 0.50 km, the engine of the rocket cuts off. What is the maximum altitude it achieves?
a. 1.9 km b. 1.3 km c. 1.6 km d. 1.0 km e. 2.1 km
According to the Big Bang theory, atoms would have likely begun to form after approximately
A. 0.5 second. B. 10 billion years. C. 1 year. D. 400,000 years. E. 3 seconds.