A cyclotron is designed with a magnet that produces a magnetic field of 1.2 T. When refurbished, the magnet is replaced by one that produces a 1.5-T field
How does the maximum kinetic energy achieved by the protons change compared to their previous maximum kinetic energy?
A) It increases by 56%.
B) It decreases by 56%.
C) It does not change.
D) It decreases by 25%.
E) It increases by 25%.
A
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Photoelectric Effect: What is the cutoff (threshold) frequency for a metal surface that has a work function of 5.42 eV? (1 eV = 1.60 × 10-19 J, h = 6.626 × 10-34 J ? s)
A. 1.31 × 1015 Hz B. 2.01 × 1015 Hz C. 3.01 × 1015 Hz D. 5.02 × 1015 Hz E. 6.04 × 1015 Hz
Suppose you see a photo showing Jupiter half in sunlight and half in shadow (i.e., a first-quarter Jupiter). This photo might have been taken by
A) the Keck telescope, on Mauna Kea, Hawaii. B) the Arecibo radio telescope in Puerto Rico. C) the Hubble Space Telescope (which orbits Earth). D) the Juno spacecraft that is orbiting Jupiter.
When two or more resistors are connected in parallel to a battery
A) the voltage across each resistor is the same. B) the total current flowing from the battery equals the sum of the currents flowing through each resistor. C) the equivalent resistance of the combination is less than the resistance of any one of the resistors. D) all of the other choices are true.
Absolute zero is
a. 0 K. b. – 459.67°F. c. – 273.15°C. d. 0 on any temperature scale.