A light rope (small $m/L$) is fused to a heavy rope (large $m/L$). If I wiggle the **light** rope,
1. most of the wiggles are reflected back; very few wiggles transmit through the heavy rope
2. some of the wiggles are reflected back; some of the wiggles transmit through the heavy rope
3. very few of the wiggles are reflected back; most of the wiggles transmit through the heavy rope
4. ???
Note:
* Correct answer: A
A light rope (small $m/L$) is fused to a heavy rope (large $m/L$). If I wiggle the **heavy** rope,
1. most of the wiggles are reflected back; very few wiggles transmit through the light rope
2. some of the wiggles are reflected back; some of the wiggles transmit through the light rope
3. very few of the wiggles are reflected back; most of the wiggles transmit through the light rope
4. ???
Note:
* Correct answer: B/C
How do the speed of the waves compare in the light rope ($v_l$) and heavy rope ($v_H$)?
1. $v_l < v_H$
2. $v_l = v_H$
3. $v_l > v_H$
Note:
* Correct Answer: C
## Announcements
* Homework 9 posted (teams submit one project problem; same repository for all project problems)
* Quiz 5 on Friday March 24th (DC out of town; quiz for first 20-25 minutes of class)
* Topic of quiz given this Friday (likely, introduction to waves and some sketching)
For our reflected and transmitted waves, how many unknowns have we introduced?
$$\mathbf{E}_R = \widetilde{E_R}e^{i(k_Rz-\omega_Rt)}\hat{n}_R$$
$$\mathbf{E}_T = \widetilde{E_T}e^{i(k_Tz-\omega_Tt)}\hat{n}_T$$
1. 2
2. 4
3. 8
4. 12
5. None of the above
Note:
* Correct answer: D
* It's about 12.
For our reflected and transmitted waves, how many unknowns have we introduced?
$$\mathbf{E}_R = \widetilde{E_R}e^{i(k_Iz-\omega_It)}\hat{n}_I$$
$$\mathbf{E}_T = \widetilde{E_T}e^{i(k_Tz-\omega_It)}\hat{n}_I$$
1. 2
2. 4
3. 8
4. 12
5. None of the above
Note:
* Correct answer: A
An EM wave is normally incident on a boundary between two materials ($n_1 \ll n_2$). If the incident wave starts in **material 1**,
1. most of the wave is reflected back; very little of the wave transmits through material 2
2. some of the wave is reflected back; some of the wave transmits through material 2
3. very little of the wave is reflected back; most of the wave transmits through material 2
4. ???
Note:
* Correct Answer: A
An EM wave is normally incident on a boundary between two materials ($n_1 \ll n_2$). If the incident wave starts in **material 2**,
1. most of the wave is reflected back; very little of the wave transmits through material 1
2. some of the wave is reflected back; some of the wave transmits through material 1
3. very little of the wave is reflected back; most of the wave transmits through material 1
4. ???
Note:
* Correct Answer: A
An EM wave is normally incident on a boundary between two materials ($n_1$ is close to $n_2$). If the incident wave starts in **material 1**,
1. most of the wave is reflected back; very little of the wave transmits through material 1
2. some of the wave is reflected back; some of the wave transmits through material 1
3. very little of the wave is reflected back; most of the wave transmits through material 1
4. ???
Note:
* Correct Answer: C