The de Broglie wavelength of which of the following objects would be smallest if the objects all had the same momentum?
e,
The de Broglie wavelength of matter is proportional to Planck's constant and inversely proportional to the momentum of the particle. If all the objects had the same momentum, they would all have the same wavelength.
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The speed of propagation of a transverse wave on a 2.0-m long string fixed at both ends is 200 m/s. Which one of the following is not a resonant frequency of this string?
A) 25 Hz B) 50 Hz C) 100 Hz D) 200 Hz
The wavelength of the hydrogen line from level 1 to level 2 in a hot star is ____________ the wavelength of the same line in a cool star. The stars have the same radial velocities away from Earth
a. larger than b. the same as c. smaller than d. not enough information to answer
The prefixes which are abbreviated f, d, and T represent which of the following?
a. 10-15, 102, and 1024
b. 10-30, 10-2, and 1024
c. 1?0-30, 10-1, and 10-2
d. 10-13, 102, and 1024
e. 10-15, 10-1, and 1012
What is the net power radiated by a little animal with a surface area of 0.075 m2 if his emissivity is 0.75, his skin temperature is 315 K, and he is in a room with a temperature of 290 K? (? = 5.67 × 10-8 W/m2 ? K4)
A) 8.8 W B) 6.0 W C) 8.0 W D) 15 W E) 18 W