A coil of wire is connected to a galvanometer. When the coil is rotated in a magnetic field, the galvanometer records a current. The current results because of __________
Fill in the blank(s) with correct word
electromagnetic induction
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When a metal surface is illuminated with light of wavelength 437 nm, the stopping potential for photoelectrons is 1.67 V
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J • s, e = - 1.60 × 10-19 C, 1 eV = 1.60 × 10-19 J, mel = 9.11 × 10-31 kg) (a) What is the work function of the metal, in eV? (b) What is the maximum speed of the ejected electrons?
You are moving past the Earth at 0.990c and notice your heart beating 88 beats per minute
(a) If a doctor on Earth measures your heart rate as you zip past, what will the measured rate be? (b) If you had been moving 99.99% the speed of light, what rate would you have observed your heart beats?
Certain types of sunglasses are very effective at diminishing light reflected from surfaces because of __________
Fill in the blank(s) with correct word
For an element to have an allotropic form it must have
a) more than one oxygen atom in its chemical formula. b) the ability to exist in more than one phase at room temperature. c) 4 electrons in its valence shell, so that it can easily gain or lose electrons d) two or more forms with different bonding structure in the same physical phase.