Advertisements
Advertisements
Question
Point out the waves from the given list, i.e., light, sound, radio waves, ultrasonic waves, and thermal radiation, the energy is propagated by mechanical waves.
Advertisements
Solution
The energy, in sound and ultrasonic waves, is propagated by mechanical waves.
RELATED QUESTIONS
A wave passes from one medium to another medium. Mention one property of the wave out of speed, frequency or wavelength which changes.
State the use of echo by a bat, dolphin and fisherman.
Name two sound absorbing materials (or objects) which can make our big room less echoey.
Explain how is the principle of echo used by
(a) The bat during its flight at night,
(b) The dolphin to locate small fish as its prey.
Mention two properties of a wave, one property which varies and the other which remains constant when the wave passes from one medium to another.
Draw a diagram representing a wave of amplitude 4 cm and wavelength 2 m. If the frequency of the wave is 150 Hz, calculate its velocity.
In what respect does waveforms of noise and a musical note differ. Draw diagrams to illustrate your answer.
A sound wavelength of 0.332 m has a time period of 10−3 s. If the time period is decreased to 10−4 s, calculate the wavelength and frequency of the new wave.
Explain reflection at the boundary of a rarer medium.
Match the following:
| 1. | Stethoscope | a. | Repeated reflections |
| 2. | Echogram | b. | Multiple reflections |
| 3. | SONAR | c. | Ultrasonic waves |
| 4. | Reverberation | d. | Speed of underwater objects |
