Category: Physics

Why is it called a diverging lens? The concave lens is a diverging lens, because it causes the light rays to bend away (diverge) from its axis. In this case, the lens has been shaped so that all light rays entering it parallel to its axis appear to originate from the same point, F, defined […]

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), […]

How can I impress my teacher in one day? 10 ways to impress your professor (without being the teacher’s… Be early. Make eye contact during class. Ask follow-up questions. Take advantage of office hours. When you must miss a class, e-mail the professor. Proofread your work. Thank the professor for a particularly interesting class. Take […]

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 […]

How do I get rid of the small screen on my TV? How to display or remove the Picture In Picture (PIP) window on the television screen. Pressing the small PIP button a second time decreases the size of the PIP window. Pressing the small PIP button a third time will remove the PIP window […]

What is called critical angle? When the angle of incidence in water reaches a certain critical value, the refracted ray lies along the boundary, having an angle of refraction of 90-degrees. This angle of incidence is known as the critical angle; it is the largest angle of incidence for which refraction can still occur. Why […]

Why does massless light bend near a large mass? Light can form a curve if it travels near a big mass. You are right, photons don’t have mass. You are also right, photons doesn’t follow Newton’s gravitation law. Photons can be pulled by gravity not because of their mass (they have none) but because gravity […]

What is periodic table and its properties? The periodic table, also known as the periodic table of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties. The structure of the table shows periodic trends. What are two characteristics of elements? All elements have […]

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 […]

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 […]