Amplitude

Q.

Lightwave is traveling along the $y$-direction. If the corresponding $\overrightarrow{E}$ vector at any time along the $x$−axis, the direction of $\overrightarrow{B}$ vector at that time is along

1. $x$−axis

2. $y$−axis

3. $-z$−axis

4. $z$−axis

Q.

An electromagnetic wave in vacuum has the electric and magnetic field $\overrightarrow{E}$ and $\overrightarrow{B}$, which are always perpendicular to each other. The direction of polarization is given by $\overrightarrow{X}$ and that of wave propagation by $\overrightarrow{k}$. Then

1. $\overrightarrow{X}||\overrightarrow{B}and\overrightarrow{k}||\overrightarrow{B}\times \overrightarrow{E}$

2. $\overrightarrow{X}||\overrightarrow{B}and\overrightarrow{k}||\overrightarrow{B}\times \overrightarrow{B}$

3. $\overrightarrow{X}||\overrightarrow{B}and\overrightarrow{k}||\overrightarrow{E}\times \overrightarrow{B}$

4. $\overrightarrow{X}||\overrightarrow{E}and\overrightarrow{k}||\overrightarrow{B}\times \overrightarrow{E}$

Q. A vibrating tuning fork generates a wave given by $y=0.1\sin \pi (0.1x-2t)$ where $x$ and $y$ are in $\text{metre}$ and time $t$ in $\text{second}$. The distance travelled by the wave while the fork completes $25$ vibrations is

1. $250\text{m}$
2. $750\text{m}$
3. $500\text{m}$
4. $1000\text{m}$

Q. Amplitude is the distance from trough to crest.

1. False
2. True