Category: Physics

What is the most important vein in your body? The superior vena cava is the large vein that brings blood from the head and arms to the heart, and the inferior vena cava brings blood from the abdomen and legs into the heart. Where is the largest vein in the body? The largest vein in […]

Is a recorder an open or closed pipe? Flutes and recorders work like this, the “embouchure” or “window” acting as an open end. On the other hand, in a pipe closed at one end, like a pan flute or a stopped organ pipe, there is always an antinode at the open end and a node […]

What is normal accommodation of eye? The young human eye can change focus from distance (infinity) to as near as 6.5 cm from the eye. This dramatic change in focal power of the eye of approximately 15 dioptres (the reciprocal of focal length in metres) occurs as a consequence of a reduction in zonular tension […]

What will happen if the Earth suddenly stops rotating? At the Equator, the earth’s rotational motion is at its fastest, about a thousand miles an hour. If that motion suddenly stopped, the momentum would send things flying eastward. Moving rocks and oceans would trigger earthquakes and tsunamis. The still-moving atmosphere would scour landscapes. What is […]

What are sound waves created by? Sound is produced when an object vibrates, creating a pressure wave. This pressure wave causes particles in the surrounding medium (air, water, or solid) to have vibrational motion. As the particles vibrate, they move nearby particles, transmitting the sound further through the medium. What happens to sound waves in […]

What is the downside of nuclear fusion? But fusion reactors have other serious problems that also afflict today’s fission reactors, including neutron radiation damage and radioactive waste, potential tritium release, the burden on coolant resources, outsize operating costs, and increased risks of nuclear weapons proliferation. What are pros and cons of fusion? List of Pros […]

What type of image is formed by a concave mirror? Concave mirrors form both real and virtual images. When the concave mirror is placed very close to the object, a virtual and magnified image is obtained and if we increase the distance between the object and the mirror, the size of the image reduces and […]

Why is glass not considered a true solid? Glass is not a slow-moving liquid. It is a solid, albeit an odd one. It is called an amorphous solid because it lacks the ordered molecular structure of true solids, and yet its irregular structure is too rigid for it to qualify as a liquid. What is […]

What is Z in the Rydberg equation? Rydberg formula Z is the atomic number (for hydrogen Z = 1 ), n₁ is the principal quantum number of the initial state (initial energy level), n₂ is the principal quantum number of the final state (final energy level), R is the Rydberg constant for hydrogen R ≈ […]

Is Energy added or released when boiling water is changed to steam? When liquid water turns to steam the molecules move (faster or slower) and heat is (added or removed) from the water. The molecules in the steam have (more or less) Kinetic Energy. When liquid water turns to steam the molecules move (faster or […]