Astronomers use ________ to determine the magnetic field of white dwarfs.
A. the Zeeman splitting of spectral lines
B. the doppler effect
C. conservation of angular momentum
D. Wien's law
Answer: A
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One fairly crude method of determining the size of a molecule is to treat the molecule as an infinite square well (a box) with an electron trapped inside, and to measure the wavelengths of emitted photons
If the photon emitted during the n = 2 to n = 1 transition has wavelength 1940 nm, what is the width of the molecule? (c = 3.00 × 108 m/s, h = 6.626 × 10-34J ? s, mel = 9.11 × 10-31 kg) A) 1.21 nm B) 1.12 nm C) 1.45 nm D) 1.33 nm
If a sheet containing two very thin slits is heated (without damaging it), what happens to the angular location of the first-order interference minimum?
A) It moves toward the centerline. B) It moves away from the centerline. C) It doesn't change.
A 1.5-kg mass attached to an ideal massless spring with a spring constant of 20.0 N/m oscillates on a horizontal, frictionless track
At time t = 0.00 s, the mass is released from rest at x = 10.0 cm. (That is, the spring is stretched by 10.0 cm.) (a) Find the frequency of the oscillations. (b) Determine the maximum speed of the mass. At what point in the motion does the maximum speed occur? (c) What is the maximum acceleration of the mass? At what point in the motion does the maximum acceleration occur? (d) Determine the total energy of the oscillating system. (e) Express the displacement x as a function of time t.
A thin converging lens is found to form an image of a distant building 24 cm from the lens. If an object is placed 16 cm from the lens, how far from the object will the image be?
A) 64 cm B) 72 cm C) 32 cm D) 96 cm E) 48 cm