Answer:
A. Using
Fl= ( v+vl/v+vz)fz
= (340+19/340+31) x 2020
= 1954.7Hz
Then to find the frequency of sound when reflected from the truck such that the driver becomes the listener
we use
F"= ( v+vz/v+vl) fz
= 340+31/340+19 x 2020
2087.5Hz
B to find the wavelength of sound we use
Wavelength= V+vl/ F"
= 340+31/2087.5= 0.18m
The answer is D, Carbon and hydrogen
When temperature decreases the atoms(or molecules) within the substance begin to slow down.
Answer:
A: Sound waves produce an echo
Explanation:
because the cup is a hard smooth surface you can hear the voice
Answer:
The size and separation of the plates.
Explanation:
We know that the capacitance of a parallel-plate capacitor is given by :
Where
A is the area of cross section of the plate
d is the separation between the plates
It is clear that the capacitance of a parallel-plate capacitor is directly proportional to the area of plate and inversely proportional to the separation between the plates. So, the capacitance of a parallel-plate capacitor can be determined by the the size and separation of the plates. Hence, the correct option is (A).