Combining two sounds of equal intensity will give a sound level ___________ than the sound level due to just one of them
a. twice as loud b. 3 dB higher
c. 10 dB higher d. 2 dB higher
b
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Which one of the following is not one of the four major features of the solar system?
A. Large bodies in the solar system have orderly motions. B. Planets fall into two major categories (terrestrial and jovian). C. Several exceptions to the general trends stand out. D. Swarms of asteroids and comets populate the solar system. E. The solar system contains eight planets plus dwarf planets (such as Ceres, Pluto, and Eris).
A box is moved 10 m across a smooth floor by a force F making a downward angle with the floor, so that there is effectively a 4 N force acting parallel to the floor in the direction of motion and a 3 N force acting perpendicular to the floor. The force F acts for 20 seconds. The impulse delivered to the box by the floor during this process has magnitude
A. 60 Ns. B. zero. C. 100 Ns. D. 80 Ns. E. Can't tell without knowing the weight of the box
What is the spectral type of a main sequence star with a luminosity 100 times greater than the sun?
A) G B) A C) M D) O
Light of wavelength 105 nm falls on a metal surface for which the work function is 5.00 eV
What is the minimum de Broglie wavelength of the photoelectrons emitted from this metal? (h = 6.626 × 10-34 J ? s = 4.14 × 10-15 eV ? s, c = 3.00 × 108 m/s, mel = 9.11 × 10-31 kg, 1 eV = 1.60 × 10-19 J) A) 0.66 nm B) 0.47 nm C) 0.24 nm D) 0.94 nm E) 0.33 nm