I believe the answer is b
Answer:
Explanation:
As per Doppler's effect of sound the frequency of the sound when source is approaching the observer is given as
similarly when source is moving away from the observer then its frequency is given as
now we know that the ratio of two frequency is
Answer:
A
Explanation:
The closer an object is to light speed, the slower time flows for the object
It seems you didnt give the last answer, but a - d seem like pretty reasonable things to do so it is probably C.
Density = 2.7g/cm3
mass =8.1grams
from density =(mass)/volume
we can determine the volume of aluminium by simply changing the subject of the subject of the formula from density to volume
so we have
volume=mass/density
=(8.1grams)/(2.7g/cm3)
=3cm3