According to Wien's law, the dominant wavelength in the continuous emission spectrum of a red apple is 700 nm. (Hint: use Wien's law.)
Answer the following statement true (T) or false (F)
False
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A Carnot heat engine operates between 400 K and 500 K. Its efficiency is:
A. 20% B. 25% C. 44% D. 79% E. 100%
A 2.0-C charge moves with a velocity of 
m/s and experiences a magnetic force of 
N. The x component of the magnetic field is equal to zero. Determine the y component of the magnetic field.
A. ?3.0 T B. +3.0 T C. +5.0 T D. ?5.0 T E. +6.0 T
Venus may have been more Earth-like in the past because
A) it was rotating more rapidly B) the Sun was dimmer, putting out less solar radiation C) it was not as close to the Sun D) its atmosphere was thinner
Before it arrived in orbit about Eros, the NEAR spacecraft visited
A) the asteroid Gaspra. B) the Moon. C) Mars. D) the asteroid Mathilde. E) Venus.