Photoelectric Effect: A photocathode that has a work function of 2.4 eV is illuminated with monochromatic light having photon energy 3.5 eV. What is the wavelength of this light? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A. 350 nm
B. 330 nm
C. 300 nm
D. 380 nm
E. 410 nm
Answer: A
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The critical fiber length divided by the fiber _________is equal to the critical aspect ratio.
Fill in the blank(s) with the appropriate word(s).
A mission that NASA is planning to launch between 2022 and 2025 will be able to confirm the presence of a subsurface ocean on Europa by using a
A) spectrometer to detect the spectral signature of liquid water at and beneath the surface B) camera to observe the formation and breakup of icebergs on the surface C) projectile to break the thin icy crust to reveal the water below D) laser altimeter to detect the regular bulging of the thin icy crust on top of the ocean due to tidal forces
Kinetic Energy: A space barge pushes on a spaceship with a mass of 15,000 kg and accelerates it from a speed of 0.600c to a speed of 0.700c. How much work does the barge have to do to accomplish this? (c = 3.00 × 108 m/s)
A. 1.35 × 1020 J B. 2.03 × 1020 J C. 2.70 × 1020 J D. 5.42 × 1020 J E. 8.78 × 1019 J
A fixed amount of ideal gas is held in a rigid container that expands negligibly when heated. At 20°C the gas pressure is p. If we add enough heat to increase the temperature from 20°C to 40°C, the pressure will be
A) impossible to determine since we do not know the number of moles of gas in the container. B) greater than 2p. C) less than 2p. D) equal to 2p. E) impossible to determine since we do not know the volume of gas in the container.