What is a mechanical wave? It is the propagation of a perturbation. the thermal

Question

What is a mechanical wave? It is
the propagation of a perturbation.
the thermal vibration of a medium.
the propagation of mass in a medium.
the oscillation of electric charges.
the oscillation of light sources.

What is a transverse wave?
It is a wave for which...
the direction of propagation is parallel to the direction of oscillation.
the direction of propagation is parallel to the velocity of propagation.
the direction of propagation is parallel to the velocity of oscillation.
the direction of oscillation is perpendicular to the direction of propagation.
the direction of oscillation is parallel to the velocity of oscillation.

Which of the following statements is not correct concerning the properties of sound waves?
Two sounds with different frequencies propagate at the same speed.
The propagation of sound requires a material medium.
Sound waves are longitudinal waves.
The speed of sound waves is independent of the properties of the gas.
Sound waves produce interferences.

Two waves, in one dimension, having the same amplitude and frequency, undergo interference while oscillating out of phase. How large is the maximum amplitude of the resultant wave?
Twice smaller than the amplitude of the initial waves.
The same than the amplitudes of the initial waves.
Twice larger than the amplitude of the initial waves.
Zero since there is no resultant wave.
None of the other answers is correct.

Which of the following can change the measured frequency of a wave?
Absorption
Refraction
Diffraction
Transmission
Doppler effect

In the classical picture (pre-quantum physics), light is considered to be:
An electromagnetic wave.
Propagating charges.
A matter current.
Propagating gravitational fields.
An electric current.

In order for light to propagate it is necessary to:
None of the other answers is correct.
Have the medium filled with air.
Remove all masses from the medium.
Perturb the medium where light propagates.
Have the medium filled with electric charges.

What is the wavelength of a light beam which has a frequency of 7.20

Explanation / Answer

A wave can be described mathematically using a series of parameters including its amplitude, wavelength, wavenumber, period, and frequency. The amplitude of a wave (commonly denoted as A or another letter) is a measure of the maximum disturbance in the medium during one wave cycle. In the illustration to the right, this is the maximum vertical distance between the baseline and the wave. The units for measuring amplitude depend on the type of wave. Waves on a string have an amplitude expressed in terms of distance (meters); sound waves, as pressure (in pascals); and electromagnetic waves, as the amplitude of the electric field (in volts/meter). The amplitude may be constant, in which case the wave is called a continuous wave (c.w.), or it may vary with time or position. The form of variation of amplitude is called the envelope of the wave. The wavelength (denoted as ?) is the distance between two successive crests (or troughs). It is generally measured on the metric

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