You observe a star and you want to plot it on an H-R diagram. You will need to measure all of the following, except the star's ________
A) apparent brightness B) spectral type
C) distance D) mass
D
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Sound waves are part of the Electromagnetic spectrum.
a. true b. false
Which of the following actions will increase the energy of a photon? (There could be more than one correct choice.)
A) Increase its wavelength. B) Increase its frequency. C) Decrease its wavelength. D) Decrease its frequency. E) Increase its speed.
An alternating current circuit has resistance R, inductance L, and capacitance C in series with a voltage source. Which statement is correct?
A. The voltage across the capacitor leads the voltage across the inductor by 90°. B. The voltage across the inductor leads the voltage across the capacitor by 90°. C. The voltage across the inductor leads the voltage across the resistor by 180°. D. The voltage across the inductor is out of phase with the voltage across the capacitor by 180°. E. Both voltages lead the voltage across the resistor by 90°.
A machinist with normal vision has a near point at 25 cm. This machinist wears +4.25-diopter eyeglasses in order to do very close work
With these eyeglasses, what is the near point of the machinist? Assume that he wears the glasses extremely close to his eyes. A) 12 cm B) 10 cm C) 7 cm D) 15 cm E) 17 cm