Photo AI
Explain why the gravitational force can be ignored for sub-atomic particles - Leaving Cert Physics - Question (i) - 2008
Question (i)
Explain why the gravitational force can be ignored for sub-atomic particles. or How can a galvanometer be converted into a voltmeter?
Worked Solution & Example Answer:Explain why the gravitational force can be ignored for sub-atomic particles - Leaving Cert Physics - Question (i) - 2008
Step 1
Explain why the gravitational force can be ignored for sub-atomic particles.
Answer
The gravitational force can be ignored for sub-atomic particles due to the extremely small masses that these particles possess.
Since gravitational force ( ) is calculated using the formula: F_g = rac{G imes m_1 imes m_2}{r^2} where:
- is the gravitational constant,
- and are the masses of the objects, and
- is the distance between their centers, it is evident that the force is directly proportional to the mass of the objects. In the case of sub-atomic particles, these masses are significantly smaller compared to everyday objects, thus resulting in an extremely weak gravitational force.
Furthermore, among the fundamental forces, gravity is the weakest, especially at the quantum level, allowing other forces—like electromagnetic forces—to dominate particle interactions.
Step 2
How can a galvanometer be converted into a voltmeter?
Answer
To convert a galvanometer into a voltmeter, the following steps are required:
-
Add a Large Resistance in Series: This large resistance limits the current flowing through the galvanometer while allowing it to measure the voltage across the circuit without drawing too much current.
-
Connection: Ensure that the galvanometer is properly connected in series with the large resistor to accurately measure the voltage.