The diagram is of a simple spectroscope. If lens #1 were omitted, the resulting spectrum would be
1) much dimmer.
2) upside down.
3) no different.
If, instead, the slit were opened too wide, the middle of the spectrum would appear
4) white.
5) much narrower.
6) black.
7) a broader yellow.
Answer: 1, 4
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If observations had shown that the cosmic microwave background was perfectly smooth (rather than having very slight variations in temperature), then we would have no way to account for
A) the relationship between the strong and the weak force. B) the fact that our universe is expanding. C) how galaxies came to exist. D) the existence of helium in the universe.
A car travels in a due northerly direction at a speed of 55 km/h. The traces of rain on the side windows of the car make an angle of 60 degrees with respect to the horizontal. If the rain is falling vertically with respect to the earth, what is the speed of the rain with respect to the earth?
a. 48 km/h b. 95 km/h c. 58 km/h d. 32 km/h e. 80 km/h
If I1 goes to the right through R1, I2 goes to the right through R2, and I3 goes to the right through R3, what is the resulting equation resulting from applying Kirchhoff’s junction rule at point b?
a.
I1 + I2 + I3 = 0
b.
I1 + I2 – I3 = 0
c.
I1 – I2 + I3 = 0
d.
I1 – I2 – I3 = 0
In which of these v versus t graphs is the acceleration changing?
A. (a)
B. (b)
C. (c)
D. (d)
