Why aren't optical or radio telescopes used in particle astronomy, which studies cosmic waves and gravity waves?
a. Cosmic and gravity waves are too dangerous to detect
b. Particle astronomy can only be studied in deep space.
c. Cosmic and gravity waves are too large of particles for ground-based telescopes.
d. Optical and radio telescopes can only detect electromagnetic radiation.
e. Optical and radio telescopes are not technologically advanced enough to capture these particles.
d
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Blood pressure is normally measured with the cuff of the sphygmomanometer around the arm. Suppose that the blood pressure is measured with the cuff around the calf of the leg of a standing person. The reading of the blood pressure will be
1.the same here as it is for the arm. 2.less than it is for the arm. 3.greater than it is for the arm.
Light incident on a thin film is reflected and transmitted at each surface. Why does a thin film have to be "thin" for an interference pattern to form?
a. Light would not penetrate a thick film. b. The surfaces of the film must be as close to perfectly parallel as possible. Irregularities would be magnified in a thick film. c. The thickness of the film must be less than the wavelength of light. d. Light is not slowed down when it enters into a thin film. e. Light speeds up as it enters a thin film.
A bicycle whose wheels have a radius of 66 cm is traveling at 2.0 m/s. If the wheels do not slip, what is the angular speed of the wheels?
What will be an ideal response?
Which of the following best describes the operation of a photovoltaic (solar) cell?