Quick quiz 3
What is the typical size of an atomic
nucleus?
100%
1.
2.
3.
4.
5.
10-17 m
10-15 m
10-13 m
10-11 m
10-9 m
10%
10%
0%
1
2
3
0%
4
5
What is the typical size of an atom (and almost
exactly the O-H bond length in water)
70%
1.
2.
3.
4.
5.
10-16 m
10-14 m
10-12 m
10-10 m
10-8 m
40%
0%
1
0%
2
0%
3
4
5
What is the typical speed of a satellite in a lowaltitude orbit?
(orbit length ~ 40000 km)
1.
2.
3.
4.
5.
8 ms-1
80 ms-1
800 ms-1
8000 ms-1
80000 ms-1
45%
36%
27%
18%
9%
1
2
3
4
5
What is the typical density of a metal?
50%
1.
2.
3.
4.
5.
4000 kgm-3
6000 kgm-3
8000 kgm-3
12000 kgm-3
20000 kgm-3
40%
20%
20%
0%
1
2
3
4
5
The moment of inertia of a uniform density
sphere of radius R and mass M is
40%
1.
2.
3.
4.
5.
2/5 MR2
1/3 MR2
2/3 MR2
1/2 MR2
3/5 MR2
30%
20%
20%
0%
1
2
3
4
5
Wien’s constant is ~ 2 x 10-3 m K
What is the peak wavelength in the blackbody
spectrum of a body at 100 K?
44%
1.
2.
3.
4.
5.
20 microns
200 microns
2 mm
2 cm
20 cm
33%
22%
1
22%
2
3
22%
4
5
How does the average power of a human body
compare with a kettle?
60%
1.
2.
3.
4.
5.
1/100 kettle
1/20 kettle
1/5 kettle
1/2 kettle
1 kettle
30%
20%
20%
0%
1
2
3
4
5
What is (roughly) the average number density
of the universe?
40%
1.
2.
3.
4.
5.
1 particle per parsec cubed
1 particle per AU cubed
1 particle per km cubed
1 particle per metre cubed
1 particle per mm cubed
10%
1
40%
10%
2
10%
3
4
5
A camera on a space mission has a focal length
of 102.4 cm. The CCD has 1024 pixels on a
side. The pixel resolution is
80%
1.
2.
3.
4.
5.
~ 1/50 degree
~ 1/10 degree
~ 1/5 degree
~ 1/2 degree
~ 1 degree
20%
10%
10%
0%
1
2
3
4
5
Which body is this?
1.
2.
3.
4.
5.
Eros
Halley
Phobos
Hyperion
Amalthea
73%
18%
18%
0%
1
2
0%
3
4
5