Physci final 2 Flashcards
An ac voltage can be easily increased or decreased using a…
transformer.
A motor converts _____ into _____.
Electrical energy
to
Mechanical energy
(generator - mech to elec)
Wave frequency is inversely proportional to
period.
Wave amplitude is related to
Intensity
What sound frequency lies in audible range?
2500 Hz
The property of a wave that is related to the brightness of visible light is
amplitude
Light waves travel fastest in
a vacuum
Which is not an electromagnetic wave?
Sound wave
Electromagnetic waves have
all of these
An echo is a good example of the
reflection of sound waves.
Ohm’s law gives the relationship between…
current and voltage
a hertz is a measure of ___
frequency
A change in direction of a wave as a result of its encountering a sharp edge is…
diffraction
In a transformer, the input ____ is equal to the output.
power
The approximate speed of sound in air is
0.344 km/s
