What is the slit spacing of a grating necessary so that 600-nm light will produce a first order principal maximum at 25.0° away from the centerline?
A) 1.42 ?m
B) 2.01 ?m
C) 3.12 ?m
D) 4.12 ?m
E) 5.44 ?m
A
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A hunter wishes to cross a river that is 1.5 km wide and flows with a velocity of 5.0 km/h parallel to its banks. The hunter uses a small powerboat that moves at a maximum speed of 12 km/h with respect to the water. What is the minimum time for crossing?
Theoretical calculations indicate that a star more massive than some threshold around 15 or 20 solar masses will collapse and become a black hole when its nuclear fuel is exhausted
Indicate whether the statement is true or false
How can close analysis of the spectra of quasars let us map the whole universe?
What will be an ideal response?
A 1500-W heater is connected to a 120-V line. How much heat energy does it produce in 2.0 hours?
A) 1.5 kJ B) 3.0 kJ C) 0.18 MJ D) 11 MJ E) 18 MJ