 Back |
Next
|
Numerical
problem examples
-
Given
the semimajor axis of the orbit of a satellite about its planet, how long
does it take for the satellite to make one complete orbit?
-
Interstellar
hydrogen emits radio waves with a wavelength equal to 21 cm. What
is the frequency of this radio wave? What is the energy?
-
n
= c/l
-
E
= hn
-
h
= 4.135 x 10-15 eV s
-
c
= 3 x 108 m/s
-
be
sure to convert from cm to m
-
Answer:
n
= 1.4 GHz, E = 5.9 x 10-6 eV
-
Radar
observations are used from Venus-orbiting spacecraft to evaluate mountain
heights by measuring the time difference between echoes from mountain peaks
and from the surrounding plains. In this technique, what would be
the time delay from Maxwell Montes, which rises 12 km above the plain?
-
DRAW
A FIGURE!
-
in
this problem, we have time and distance
-
what
third quantity links time and distance?
-
speed
-
Method:
compute
time it takes for light to go 24 km
-
Answer:
8
x 10-5 s = 80 ms
| Back |
Next
|