Photon Energy: What is the photon energy of red light having a wavelength of 6.40 × 102 nm? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s)
A. 1.13 × 10-19 J
B. 1.31 × 10-19 J
C. 3.11 × 10-19 J
D. 1.94 × 10-19 J
Answer: C
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A resistor is connected to an ideal ac power supply. (a) The phase angle between the current and voltage is A. 0 B) ?/2 radians. C) -?/2 radians. D) ? radians. E) 3?/4 radians
(b) The current in the resistor A. leads the voltage across the resistor by 90°. B) lags the voltage across the resistor by 90°. C) is in phase with the voltage across the resistor. D) the voltage across the resistor by 45°. E) lags the voltage across the resistor by 45°. (c) How does the average power dissipated in the resistor change as the frequency in the ac power supply decreases? A. It decreases. B) It increases. C) It does not change. D) It increases or decreases depending on the sign of the phase angle.
What creates a total lunar eclipse? a. The Sun passes completely through Earth's umbra. b. The Moon passes completely through Earth's umbra
c. The Moon passes through some of Earth's penumbra. d. The Earth passes completely through the Moon's umbra. e. The Earth passes through some of the Moon's penumbra.
The speed of sound varies with
A) loudness. B) frequency. C) wavelength. D) all of the above E) none of the above
A child pulls on a wagon with a force of 75N If the wagon moves a total of 42m in 3.1min what is the average power delivered by the child?
A) 21 W B) 22 W C) 26 W D) 17 W