Category: Physics

Why can hydrogen only have two valence electrons? Because hydrogen only has one electron surrounding its nucleus, its valence shell is the first energy shell, which only needs two electrons to be full. Hydrogen tends to form covalent bonds because a single covalent bond will fill its shell. How many valence electrons are present in […]

What if we could see gamma rays? If you could see gamma-rays, the night sky would look strange and unfamiliar. The gamma-ray moon just looks like a round blob – lunar features are not visible. In high-energy gamma rays, the Moon is actually brighter than the quiet Sun. Can gamma rays turn you into the […]

Can you have a growth spurt at 16? The occurrence of teenage growth spurt might vary. Yet, on average, a major growth spurt during puberty usually happens between 8 and 13 years in girls and 9.5 and 14 years in boys (1). Whereas this phase of rapid growth in most girls ends by 15 years […]

How do you check the oxygen level in an aquarium? The best way to test the amount of dissolved oxygen in your aquarium’s water is with a portable dissolved oxygen meter. After calibrating the meter, you can place a probe into the tank water, and read the results on the digital display. How do you […]

Why is resistance less when resistors are joined in parallel? When resistances are connected in parallel the current in the circuit gets parallel branches to go from one point to another across which the potential difference is applied. So, the equivalent resistance is less when resistors are connected in parallel. What happens to resistance in […]

What is SI unit of merit? Figure of merit is the amount of current been passed in the unit of deflection in a galvanometer. Its SI unit is Ampere per division. What’s the difference between a galvanometer and a multimeter? The galvanometer is converted into the ammeter by connecting the resistance in parallel with the […]

What is the relationship between temperature and height in the mesosphere? The mesosphere is directly above the stratosphere and below the thermosphere. It extends from about 50 to 85 km (31 to 53 miles) above our planet. Temperature decreases with height throughout the mesosphere. The coldest temperatures in Earth’s atmosphere, about -90° C (-130° F), […]

What is the value of the spring constant k? The letter k represents the “spring constant,” a number which essentially tells us how “stiff” a spring is. If you have a large value of k, that means more force is required to stretch it a certain length than you would need to stretch a less […]

Does an object have no energy moving? Kinetic and potential energies are found in all objects. If an object is moving, it is said to have kinetic energy (KE). Potential energy (PE) is energy that is “stored” because of the position and/or arrangement of the object. And in falling, can exert forces and do work […]

How do you find velocity before hitting the ground? If you want to know the velocity of the object at some point before it hits the ground, use the distance the object has fallen at that point in place of the distance to the ground in either equation. Multiply feet per second by 0.68 to […]