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# Physics

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Cards in this guide (21)
What does absolute zero means

Absolute zero is -273.15 degrees C or -459.67 Degrees F. It is measured on the Kelvin scale as 0 degrees K. I found this: "In all materials, a point is eventually reached at which all oscillations are the slowest they can possibly be. The temperature which corresponds to this point is called absolute zero. Note that the oscillations never come to a complete stop, even at absolute zero." Here: http://www.pa.msu.edu/sciencet/ask_st/012992.html

How is the amplitude of a longitudinal wave measured

Amplitude of a longitudinal wave is measured as a change in pressure.

What is the meaning of measurement of loudness

Units used to measure loudness are Sone (loudness N) and Phon (loudness level L). Scroll down to related links and look at "Loudness - Wikipedia" and "Sound level change and the change of the respective factor of volume and loudness"

What is the term for the unit that measures wave frequency

The unit of frequency is "Hertz", abbreviated "Hz".

Also called "cycles". Also called "per second".

What is the unit of measure that expresses potential difference between two electrodes in a battery

Volt

How is the energy of the sun transferred through the void of space

What is the term used to describe the buildup of electrical charges on objects due to friction

static electricity

What if your body applies force to the ground as weight If you weigh 450 newtons and carry a backpack that weighs 45 newtons what is the net force applied downward to the ground

495 n

Which factor most influences the amount of energy needed to change the temperature of a substance

specific heat capacity

How is energy transferred through the void of space

Which of these are part of a wedge

two inclined planes,double wedge and single wedge

What are the two pieces of different metals that are in contact with electrolytes in a battery

These are the electrodes.

What term is used to indicate charged solutions contained in wet cell batteries

electrolytes

Which of these most affects the strength of an electric field

distance between charged particles

Which term defines something that transfers thermal energy efficiently

Something that transfers thermal energy efficiently is called a conductor.

What is one way that alternating current is more useful than direct current-

It can easily be transformed up to a high voltage for power transmission, and back down for home supplies at 120/240 volts.

What causes refraction-

Refraction is caused by light crossing from one medium to another.

What occurs when two or more waves occupy the same space at the same time-

When two or more waves occupy the same space at the same time, an interference pattern is created.

What produces standing waves-

Standing waves are the result of an interference of two waves that are traveling along the same medium in opposite directions.

Which of these allows electrons to move through it easily

conductor

What produces magnetism's

A magnetic field is produced by any charged particle in motion. It is a fundamental law of nature (as expressed by the electromagnetic force) that a magnetic field will form around any moving charge. We usually think of moving electrons as creating a magnetic field, and this is absolutely correct, but any moving charge can create a magnetic field.

As for what magnetism is, this question has already been answered, and link is provided below to that question.

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