Physics - Study Mode

[#801] A standing wave occurs when
Correct Answer

(A) A wave reflects upon itself

Explanation

Solution: In a bounded medium, standing waves occur when a wave with the correct wavelength meets its reflection. The interference of these two waves produces a resultant wave that does not appear to move. Standing waves don't form under just any circumstances.

[#802] The wavelength of a wave is the distance between
Correct Answer

(D) Both B & C

Explanation

Solution: The wavelength of a wave is the distance between Crest and Crest or Trough and Trough.

[#803] Longitudinal waves cannot travel through
Correct Answer

(A) Vacuum

Explanation

Solution: Sound waves are longitudinal waves. They cause particles to vibrate parallel to the direction of wave travel. Sound cannot travel through a vacuum because there are no particles to carry the vibrations.

[#804] Flight Recorder is technically called :
Correct Answer

(C) Black box

Explanation

Solution: A flight data recorder (FDR) is an electronic device employed to record any instructions sent to any electronic systems on an aircraft. Another kind of flight recorder is the cockpit voice recorder which records conversation in the cockpit, radio communications between the cockpit crew and others (including conversation with air traffic control personnel), as well as ambient sounds. Popularly referred to as a “black box” by the media, the data recorded by the FDR is used for accident investigation as well as for analyzing air safety issues, material degradation and engine performance.

[#805] A gradual increase in loudness is known as
Correct Answer

(A) Crescendo

Explanation

Solution: A gradual increase in loudness is known as crescendo.