Unpolarized light is passed through three successive Polaroid filters, each with its transmission axis at 45.0° to the preceding filter. What percentage of light gets through?
a. 0%
b. 12.5%
c. 25.0%
d. 50.0%
e. 33.3%
b
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A string on a violin is stretched between two points 20.0 cm apart with a tension of 120 N. The mass/length of the string is 0.00200 kg/m. The frequency of the mode of vibration with the lowest frequency is
A. 502 Hz. B. 550 Hz. C. 598 Hz. D. 612 Hz. E. 750 Hz.
How can the Doppler method be used to measure the orbital period of a planet?
A) by measuring the speed at which the star orbits the mutual center-of-mass of the star and planet B) by measuring the time it takes for the star's line-of-sight velocity to cycle from peak to peak C) by measuring the asymmetries in the velocity curve D) by measuring the amount by which the starlight is reduced when the planet transits
When a star's inward gravity and outward pressure are balanced, the star is said to be:
A) in gravitational collapse. B) in thermal expansion. C) in rotational equilibrium. D) in hydrostatic equilibrium. E) a stage 2 protostar.
A long solenoid (n = 80 turns/cm) carries a current of 70 mA. Determine the magnitude of the magnetic field inside the solenoid