What is the maximum number of 100-W lightbulbs you can connect in parallel in a 120-V home circuit without tripping the 20-A circuit breaker?
23
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Light of wavelength 575 nm passes through a double-slit and the third order bright fringe is seen at an angle of 6.5° away from the central fringe. What is the separation between the double slits?
A) 5.0 µm B) 10 µm C) 15 µm D) 20 µm E) 25 µm
Which of the following is NOT evidence of the existence of an interstellar medium?
a. extinction of light from distant stars b. very narrow calcium absorption lines in the spectra of O and B stars c. reddening of more distant stars d. dark cloud silhouetted against background stars e. molecular absorption lines in the spectra of cool stars
Two identical steel balls are released from rest from the same height and travel along tracks as shown and labeled below
A temperature difference of 5 K is equal to
a. a difference of 9 on the Celsius scale. b. a difference of 9 on the Fahrenheit scale. c. a difference of 2.8 on the Rankine scale. d. a difference of 0.5 on the Fahrenheit scale. e. a difference of 2.8 on the Celsius scale.