Explanation :
It is given that :
speed of sound waves, 
frequency of sound waves, 
The relation between speed of sound wave and wavelength is




Answer:
c. equal to 760 mm
Explanation:
We are told that another mercury barometer is used that has a tube of larger diameter. This means a larger area and the weight of the liquid in the tube will have increased since volume = area × height. Also, due to the larger area, the net upward force
on the mercury will have also increased by the
same amount because force = area × pressure. Therefore, as long as the pressure remains the same, the height of
the mercury will also remain the same.
Thus the height of the mercury = 760 mm
Audio frequency
An audio frequency or audible frequency is a periodic vibration whose frequency is in the band audible to the average human, the human hearing range.
Answer:
His kinetic energy increases, potential energy decreases
The sum of kinetic and potential energy is a constant at any instant before he comes to rest.
Explanation:
Snowboarder is starting from a height and moving to the down direction. As he moves down his velocity increases, we know that kinetic energy is given by the expression
, so as he moves his kinetic energy increases.
When the snowboarder is starting his potential energy is maximum(Potential energy = mgh), as he comes down his potential energy decreases.
Based on this we can conclude that the sum of potential energy and kinetic energy is a constant at any instant for a snowboarder before he comes to rest.
mgh+
= Constant