The cosmic background radiation permeating the universe has the spectrum of a 2.7-K blackbody radiator. What is the peak wavelength of this radiation? The constant in Wien's law is 0.0029 m ? K
What will be an ideal response?
1.1 mm (microwave region)
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If you pull on a box with a force of 5 N and your teacher pulls on the same box with a force of 5 N in the opposite direction, the net force on the box is
a. 10 N b. 50 N c. 5 N d. 0 N
The number of cycles of a wave passing a point per unit time is the wave's
a. speed b. frequency c. wavelength d. amplitude e. loudness
Scientists cannot agree on whether viruses are living or not because
A) they are much smaller than other simple living organisms B) they can reproduce but do not require any utilization of energy to do so C) they can only reproduce within a host cell and not independently D) under certain conditions they can reproduce, but they do not contain any DNA
Suppose you wanted to hold up an electron against the force of gravity by the attraction of a fixed proton some distance above it
How far above the electron would the proton have to be? (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C, mproton = 1.67 × 10-27 kg, melectron = 9.11 × 10-31 kg) A) 4.6 m B) 3.7 m C) 5.1 m D) 2.3 m E) 1.5 m