Progressive Waves Multiple Questions and Answers.
Exercise Questions ::
Waves
1. | The disc of a siren containing 60holes rotates at a constant speed of 360rpm. The emitted sound is in unison with a tuning fork of frequency. |
| |
| A. | 10Hz |
| B. | 360Hz |
| C. | 216Hz |
| D. | 60Hz |
|
|
| Answer: Option B |
|
|
| Explanation: |
|
Frequency of revolution of disc=360rpm=360/60rps=60rps Frequency of emitted sound=6×No.of holes =6×60=360Hz. |
| See More Information |
|
|
|
Tutorial Link: |
Published by:Michael Daani
| Answer: Option C |
|
|
| Explanation: |
|
Frequency remains unchanged when sound travels from one medium to another. |
| See More Information |
|
|
|
Tutorial Link: |
Published by:Michael Daani
3. | If wave y=Acos(ωt+kx) Is moving along x-axis, the shapes of a pulse at t=0 and t=2s. |
| |
| A. | Are different |
| B. | Are same |
| C. | May not be the same |
| D. | Unpredictable |
|
|
| Answer: Option B |
|
|
| Explanation: |
|
The shapes of y-x graph remains the same at t=0 and t=2s. |
| See More Information |
|
|
|
Tutorial Link: |
Published by:Michael Daani
| Answer: Option B |
|
|
| Explanation: |
|
y1=4sin(ωt+kx) y2=-4cos(ωt+kx) =-4sin(ωt+kx+3π/2) ∆φ=3π/2. |
| See More Information |
|
|
|
Tutorial Link: |
Published by:Michael Daani
| Answer: Option C |
|
|
| Explanation: |
|
y=0.1sin[100πt-kx] y=Asin(ωt-kx) ω=100π Wave number=ω/v=100π/100=π/m. |
| See More Information |
|
|
|
Tutorial Link: |
Published by:Michael Daani
»