The walls and ceilings of many standard auditoria are covered with perforated pads to
increase the intensity of sound waves
increase the loudness of sound waves
reduce the effect of reverberations of sound waves
increase the interference effect of sound waves
decrease the frequency of sound waves
Correct answer is C
No explanation has been provided for this answer.
Which of the following instruments produces sound by the vibration of air column?
Piano
Guitar
Flute
Hand bell
Talking drum
Correct answer is C
No explanation has been provided for this answer.
2.0cm
3.3cm
5.0cm
10.0cm
15.0cm
Correct answer is B
\(f = \frac{uv}{u+v}\)
\(5 = \frac{-10u}{-10+u}\)
\(50 + 5u = -10u\)
\(50 = -10u - 5u\)
\(u = \frac{50}{-15}\)
u= -3.3cm
The upward movement of the sap in the xylem vessel is brought about by
transpiration stream
guttation
capillarity
osmosis
cohesion
Correct answer is C
No explanation has been provided for this answer.
The loss of water vapour through the aerial parts of the plant to the atmosphere is called
respiration
guttation
osmoregulation
transpiration
diffusion
Correct answer is D
No explanation has been provided for this answer.