printed by: arvind.borde@liu.edu. printing is for personal...

PRINTED BY: arvind.borde@liu.edu. Printing is for personal, private use only. No part of this book may be reproduced or transmitted without publisher'sprior permission. Violators will be prosecuted.

Yes. No.

No.

Longer

Radio Micro Infrared

Yes.Lambda=1.5X 10^7 — 10^4 m

XXXXX

PRINTED BY: arvind.borde@liu.edu. Printing is for personal, private use only. No part of this book may be reproduced or transmitted without publisher'sprior permission. Violators will be prosecuted.

0.5 X 10^3 sec

d=3.6 X 10^5 km 1.2 sec4.2X10^14 Hz; IR4.2X10^(-7) mBlue

6X10^6Hz

2X10^10Hz3X10^5m.341 mNo

1.3X10^-2m2.5X10^18Hz

267s1267s

3.97X10^16 m

9.5X10^15m

PHY12, HW7: Work

8) c =d

t, so t =

d

c=

1.5⇥ 1011

3⇥ 108= 5⇥ 10

2s.

9) d = 3.6⇥ 108m, so t =

3.6⇥ 108

3⇥ 108= 1.2 s.

10) c = �f , so f =c

�=

3⇥ 108

7.2⇥ 10�8= 4.2⇥ 10

14Hz.

11) � =c

f=

3⇥ 108

7.14⇥ 1014= 4.2⇥ 10

�7m.

12) f =c

�=

3⇥ 108

49= 6⇥ 10

6Hz.

13) f =c

�=

3⇥ 108

1.5⇥ 10�2= 2⇥ 10

10Hz.

14) � =c

f=

3⇥ 108

103= 3⇥ 10

5m.

� =v

f=

341

103= 3.41⇥ 10

�1m.

15) � =c

f=

3⇥ 108

22.75⇥ 109= 1.3⇥ 10

�2m.

f =c

�=

3⇥ 108

0.12⇥ 10�9= 2.5⇥ 10

18Hz.

16) Radius of earth orbit: 1.5⇥ 1011

m.

Radius of Mars orbit: 2.3⇥ 1011

m.

Closest distance, dc, is the di↵erence of these.

Furthest distance, df, is the sum.

tc =0.8⇥ 10

11

3⇥ 108= 2.67⇥ 10

2s.

tf =3.8⇥ 10

11

3⇥ 108= 1.267⇥ 10

3s.

17) Seconds/year: 60⇥ 60⇥ 24⇥ 365 = 3.15⇥ 107.

d = (3⇥ 108)(4.2⇥ 3.15⇥ 10

7) = 3.97⇥ 10

16m.

18) d = (3⇥ 108)(3.15⇥ 10

7) = 9.5⇥ 10

15m.