50cm
70cm
100cm
150cm
200cm
Correct answer is A
\(\lambda\) = \(\frac{v}{f}\)
= \(\frac{340}{170}\)
= 2m ; for closed pipe
L = \(\frac{1}{4}\)\(\lambda\)
= \(\frac{1}{4}\) x \(\frac{2}{1}\)
= 0.5m
= 50cm
When a sound wave passes from air into water its
speed and frequency increases but its wavelength remains the same
speed and wavelength increases but its frequency remains the same
speed decreases
speed remains the same but its frequency and wavelength change
speed increases but its frequency and wavelength decreases
Correct answer is C
No explanation has been provided for this answer.
0.75km
1.50km
2.20km
3.00km
3.75km
Correct answer is A
Echo time = 1 \(\div\) 2 = 0.5sec
depth = velocity x time
= 1500 x 0.5
= 750m = 0.75km
Which of the following phenomena CANNOT be explained by the molecular theory of matter?
Expansion
Conduction
Convection
Radiation
Evaporation
Correct answer is D
No explanation has been provided for this answer.
Which of the following statements are NOT correct?
boiling occurs when the saturated vapour pressure of the liquid involved equals the external pressure
both the boiling point and the saturated vapour pressure of a given liquid depends on the external pressure
the saturated vapour presssure rises with increase in temperature
the saturated vapour pressure is independent of the volume available for the vapour
it is possible to boil water at a lower temperature than 100oC at high altitude
Correct answer is D
The saturated vapour pressure is dependent on the temperature of the liquid and not on the volume.