Category: Physics

Why do black bodies radiate? A black body is an idealized object that absorbs all electromagnetic radiation it comes in contact with. It then emits thermal radiation in a continuous spectrum according to its temperature. Much cooler objects like planets and humans emit the most radiation in the infrared. Can radiation travel through a vacuum? […]

Which of the following is not an example of the second law of thermodynamics? Which one of the following is not an example of the second law of thermodynamics? CO2 is exhaled as a by-product of aerobic respiration is not an example of second law of thermodynamics. Is the second law of thermodynamics a consequence […]

Is it dark during solar eclipse? In a solar eclipse, the Moon moves between the Earth and the Sun. When this happens, part of the Sun’s light is blocked. The sky slowly gets dark as the Moon moves in front of the Sun. What is the longest solar eclipse ever? The longest possible duration of […]

When we touch a metal spoon it feels cold Why? A: In general, metals feel colder or hotter to the touch than other materials at the same temperature because they’re good thermal conductors. This means they easily transfer heat to colder objects or absorb heat from warmer objects. How do you feel when you touch […]

Does AM or FM have a higher frequency? FM uses a higher frequency range and a bigger bandwidth than AM. AM radio operates from 535 kHz (kiloHertz) to 1605 kHz. When you tune the dial on your radio, the number changes by 10 kHz each time. This means that each station has 10 kHz of […]

What is the average IQ of a Navy SEAL? The Navy requires an AFQT score of at least 35. Men who succeed at BUD/S traditionally have AFQT scores of 78 or better. The 78th percentile on an IQ scale roughs out at about 112. Anecdotally, many successful SEALs run in the high-120 IQ range. How […]

What does adding baking soda to your laundry do? It may sound like an old wives’ tale, but adding baking soda to your regular amount of liquid laundry detergent truly will make your colored clothing brighter and your whites whiter. Baking soda is a natural deodorizer and cleanser, and it also softens the water, which […]

What are the high points and low points of a transverse wave called? A high point on a transverse wave is called a crest, and a low point is called a trough. Light waves and radio waves are examples of transverse waves. Longitudinal waves – If you push or pull one end of a slinky, […]

What happens to a dead star? Stars die because they exhaust their nuclear fuel. Once there is no fuel left, the star collapses and the outer layers explode as a ‘supernova’. What’s left over after a supernova explosion is a ‘neutron star’ – the collapsed core of the star – or, if there’s sufficient mass, […]

Why does it rain so much near the equator? Near the Earth’s equator, solar heating is intense year round. The Sun heats the ocean, evaporating tremendous amounts of water. As air rises, it cools, and water vapor condenses into rain. This daily cycle of heating, evaporation, and convection creates a persistent band of showers and […]