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 is the downside of nuclear fusion?
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?
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?
Is Energy added or released when boiling water is changed to steam?
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 […]
What is the highest possible frequency of sound?
What is the highest possible frequency of sound? That’s about the same as the lowest pedal on a pipe organ. On the other side of the human hearing range, the highest possible frequency heard without discomfort is 20,000Hz. While 20 to 20,000Hz forms the absolute borders of the human hearing range, our hearing is most […]
What is the difference between sampling with replacement and without replacement?
What is the difference between sampling with replacement and without replacement? What’s the Difference? When we sample with replacement, the two sample values are independent. Practically, this means that what we get on the first one doesn’t affect what we get on the second. In sampling without replacement, the two sample values aren’t independent. What […]
Can trauma change your DNA?
Can trauma change your DNA? The findings, the authors concluded, supported an “epigenetic explanation.” The idea is that trauma can leave a chemical mark on a person’s genes, which then is passed down to subsequent generations. Instead it alters the mechanism by which the gene is converted into functioning proteins, or expressed. What RNA does […]
Which type of washing machine consumes less water?
Which type of washing machine consumes less water? As a front loader uses less water, there is significant energy or electricity saving as much less water is heated. Also, front loaders dry up the cloths to a significantly higher degree (as less water is used), the dryer cycles are much shorter, thus saving electricity on […]