Apipe open at both ends produces a fundamental frequency of 262 hz in air at 20°c. if the is filled with helium at the same temperature, what fundamental frequency does it produce? assume the speed of sound in helium is 972 m/s. assume the speed of sound in the air at 20°c is 343 m/s.
a. 972 hz
b. 430 hz
c. 741 hz
d. 1113 hz .

1. B) 614 Hez

2. D) 1.3 Hz

3. B) 4.9 m

4. A) 70 Hz

5. B) 1.63 m; 211 Hz

6. C) 35.2 Hz

7. A) 17.6 Hz

8. C) 742 Hz

9. D) 573 Hz

10. A) 16 cm; 2150 Hz

Explanation: 100% :) just took quiz

sonar - device which is used to find the submit submarines, sankalp ship. sonar waves consists of a transmitter and detector which are installed in the observation centre on board of a ship. the ultrasonic waves are sent into the sea at high frequency about 1000 khz in all direction.

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.