At what orientation angle relative to the magnetic field direction does the torque of a magnetic dipole have its largest value?
a) 0°
b) 45°
c) 90°
d) 135°
e) 180°
Ans: c) 90°
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What are cosmic rays?
A) subatomic particles that travel close to the speed of light B) a form of light with shorter wavelength than gamma rays C) fast-moving dust particles in the interstellar medium D) any light waves from space
The field just outside the surface of a long conducting cylinder which has a 2.0-cm radius points radially outward and has a magnitude of 200 N/C. What is the charge density on the surface of the cylinder?
a. 2.7 nC/m2 b. 1.8 nC/m2 c. 3.5 nC/m2 d. 4.4 nC/m2 e. 0.90 nC/m2
Photoelectric Effect: A metallic surface is illuminated with light of wavelength 400 nm. If the work function for this metal is 2.40 eV, what is the maximum kinetic energy of the ejected electrons, in electron-volts? (1 eV = 1.60 × 10-19 J, c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
Fill in the blank(s) with the appropriate word(s).
Which statement about our current knowledge of elements is FALSE?
A) We now know of more than 110 elements, both natural and man-made. B) 81 stable elements have been found on Earth. C) 10 radioactive elements are also found on Earth. D) We have now produced over 50 radioactive elements not occurring in nature. E) Technetium is found in giant stars, but not yet in nature on the Earth.