Water moves to the top of tall trees because of
1 answer:
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Answer:
Gravitational force of attraction.
Explanation:
When two bodies of masses 'm' and 'M' are separated by a distance 'r', then both the bodies experience a force of attraction towards each other. This force of attraction is called gravitational force. It is a weak force but it always act between two bodies that have mass.
The magnitude of the gravitational force is directly proportional to product of the masses and inversely proportional to the square of the distance between the masses.
This means that as the distance between the bodies is increases, the gravitational force between the bodies decreases and vice versa.
The gravitational force of attraction is given as:
Answer:
Kinetic energy:
Velocity:
Explanation:
From the equations of the photo-electric effect,
We know:
Where,
1. is the Planck's constant which is
2. are the frequency of light emitted and threshold frequencies respectively.
3. is the kinetic energy of the electrons emitted.
By fact, we come to know that the threshold frequency of Zn is 300nm
And also
Where ,
1. is the speed of light
2. is the wavelength.
Thus,
Now to find velocity: