Determine the charge on a glass rod after rubbing it with silk. The charge on the glass rod is _______________ (positive or negative). The charge on the silk cloth is _______________
Fill in the blank(s) with correct word
positive, negative
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Photoelectric Effect Using Stopping Potential: When light of wavelength 350 nm is incident on a metal surface, the stopping potential of the photoelectrons is 0.500 V. What is the threshold (cutoff) frequency of this metal? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 3.47 × 1014 Hz B. 3.74 × 1014 Hz C. 4.73 × 1014 Hz D. 7.36 × 1014 Hz
You are going to construct a new optical observatory, and money is no object. Other than putting it into space, what factors will affect your decision for its location on Earth?
What will be an ideal response?
Which of the following is a form of matter and not a form of radiation?
A) gamma rays B) the electron beam that creates the picture on a TV tube C) X-rays D) None of the above are forms of radiation. E) All of the above are forms of radiation.
At the time of the vernal equinox
a) the Sun is above the equator moving southward. b) the number of hours of daylight exceeds the number of hours of darkness. c) summer begins for the Northern Hemisphere. d) the Sun is above the equator moving northward.