Which of the following statements is/are correct.
| a. |
Motion of a kink in a longitudinal spring produced by displacing one end of the spring sideways is transverse and longitudinal, both. |
| b. |
Waves produced in a cylinder containing a liquid by moving its piston back and forth is longitudinal. |
| c. |
Waves produced by a motorboat sailing in water are transverse and longitudinal, both. |
| d. |
Ultrasonic waves in air produced by a vibrating quartz crystal are longitudinal. |
1. (a), (b) and (d)
2. (b) and (d)
3. (a), (c) and (d)
4. All are correct