What is the relationship between the temperature of a substance and the speed of its molecules?
The higher the temperature of a substance, the faster the motion of the molecules.
100
Who do so few substances undergo regelation?
Regelation can occur only in substances that expand when they freeze.
100
What determines the period of a pendulum?
The period of a pendulum depends only on the length of a pendulum and acceleration of gravity.
100
What are the waves of the electromagnetic spectrum?
The electromagnetic spectrum consists of radio waves, microwaves, infrared, light, ultraviolet rays, X-rays, and gamma rays.
100
A train is moving with a wavelength of 10 m and a frequency of 2Hz. What is the wave speed?
(10m)(2Hz)=20m/s
200
What causes heat to flow?
When two substances of different temperatures are in thermal contact, heat flows from the higher-temperature substance into the lower-temperature substance.
200
What is the effect of adiabatic compression on a gas?
When work is done on a gas by adiabatically compressing it, the gas gains internal energy and becomes warmer.
200
What causes interference patterns?
Interference patterns occur when waves from different sources arrive at the same point-at the same time.
200
What causes the formation of shadows?
When light shines on an object, some of the rays may be stopped whole others pass on in a straight-line path.
200
How much energy is needed to change 5 grams of ice at 0 degrees C to 5 grams of steam at 100 degrees C?
3,600
300
How does radiation transmit heat?
Heat is transmitted in the form of radiant energy, or electromagnetic waves.
300
What is the effect of pressure on the boiling temperature of a liquid?
Increasing the pressure on the surface of a liquid raises the boiling point of the liquid.
300
What are some examples of transverse waves?
Waves in the stretched strings of musical instruments and the electromagnetic waves that make up radio waves and light are transverse.
300
What happens to an excited atom after it emits light?
After an excited atom emits light, it returns to its normal state.
300
Calculate the ideal effiencey of a power plant that runs between temperatures 400 K and 150 K.
.625
400
What causes an object to cool faster?
The colder an object's surroundings, the faster the object will cool.
400
How is energy related to the phase change?
Energy must be put into a substance to change its phase from solid to liquid to gas. Energy must be extracted from a substance to change its phase from gas to liquid to solid.
400
What causes resonance?
An object resonates when there is a force to pull it back to its starting position and enough energy to keep vibrating.
400
What are the conditions necessary for seeing a rainbow?
In order for you to see a rainbow, the sun must be shining in one part of the sky, and the water droplets in a cloud or in falling rain must be in the opposite part of the sky.
400
Convert 27 degrees Celsius to Kelvin.
K = 27 + 273
K = 300
300 K
500
How does an object's emission rate compare with its absorption rate?
Good emitters of radiant energy are also good absorbers: poor emitters are poor absorbers
500
What always happens to the entropy of systems?
According to the second law of thermodynamics, in the long run, the entropy of a system always increases for natural process.
500
What happens when an elastic material is disturbed?
When an object composed of an elastic material is disturbed, it vibrates as its own special set of frequencies, which together form its special sound.
500
How can you see photographs or movies in 3-D?
A pair of photographs or movie frames, taken a short distance apart(above average eye spacing), can be seen in 3-D when the left eye sees only the left eye view and the right eye sees only the right view.
500
The lowest freqency er can hear is about 20Hz. Calculate the wavelength associated with this frequency for sound that travels at 340m/s. How long is in meters?