As an electron slows down from 0.9980c to 0.5000c, how much momentum does it lose? (c = 3.0 × 108 m/s, melectron = 9.11 × 10-31 kg)
What will be an ideal response?
4.2 × 10-21 kg ? m.s
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Intensity of Sound: The intensity at a distance of 6.0 m from a source that is radiating equally in all directions is 6.0 × 10-10 W/m2. What is the power emitted by the source?
A. 2.1 × 10-8 W B. 2.7 × 10-7 W C. 2.1 × 10-6 W D. 2.7 × 10-5 W
Force on a Moving Charge: An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane. Calculate the magnitude of the magnetic force on the electron. (e = 1.60 × 10-19 C)
A. 2.8 × 10-10 N B. 3.2 × 10-10 N C. 2.8 × 10-12 N D. 3.2 × 10-12 N E. 0 N
Astronomers can tell whether a light source approaches or recedes from Earth by
A) its temperature. B) its change in temperature. C) its absorption spectra. D) the Doppler effect. E) all of the above
A proton initially moves left to right long the x axis at a speed of 9.0 × 10^3 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.8 m before coming to rest. If the proton's mass and charge are 1.67 × 10^?27 kg and 1.60 × 10^?19 C respectively, what is the magnitude of the electric field?
a. 4.3E+1 N/C b. 5.3E–2 N/C c. 5.3E–1 N/C d. 6.6E–1 N/C e. 1.1E+0 N/C