Answer : A. Decreases to 
Explanation :
We know the relation between speed, wave length and frequency

If the wavelength is tripled, while the speed of the wave is held constant the the frequency will decreases to 
So, the frequency will be decreases to 
Answer:
Sample Starting Temperature Ending Temperature Change in Temperature
50 g sand
50 g water
100 g water
Explanation:
Its
20C
32C
46C
Answer: The electric repulsion between the two protons is stronger than the gravitational attraction.
Explanation: Please see the attachments below
Potential energy can be found using this formula:
PE= m * g * h
where:
PE= potential energy
m=mass
g=gravitational acceleration constant (9.8 m/s^2)
h= height
So your answer is height because you also use the gravitational constant.