Electrons in an x-ray machine are accelerated from rest through a potential difference of 80,000 V. What is the kinetic energy of each of these electrons in eV?
a. 128 eV
c. 80 eV
b. 40 eV
d. 80 keV
D
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A block holding a ringing tuning fork oscillates back and forth, attached to a wall by a spring of spring on a horizontal, frictionless surface, with amplitude 17 cm. The mass of the tuning fork and block together is 0.75 kg. An observer who is situated so that the block’s direction of motion is either directly towards or away from him notes that the frequency he hears varies between 174 and 178 Hz. What is the period of motion of the block? The speed of sound at the time of the experiment is 340 m/s.
A. Cannot do without knowing the spring constant. B. 0.28 s C. 0.14 s D. 0.044 s E. 0.022 s
If the speed of light is represented by c, what equation would you use to determine the distance light travels, x, in a time t?
A. x=c*t B. x=c/t C. x=c+t D. 1/x = c*t
According to the present estimates, the Universe is about ________ years old.
A. 14 × 105 B. 14 × 107 C. 14 × 1011 D. 14 × 109
All of the following statements about the Sun's corona are true. Which one explains why it is a source of X-rays?
A) The temperature of the corona's gas is some 1 to 2 million Kelvin. B) The corona lies above the visible surface of the Sun. C) The corona's gas consists mostly of hydrogen and helium. D) The corona's structure is largely shaped by magnetic fields.