physical science
In an electromagnetic wave, the electric field is
perpendicular to both the magnetic field and the wave direction.
A 80-dB sound carries more energy than a 40-dB sound by a factor of
10,000.
The musical note A has a frequency of 440 Hz and its wavelength in seawater is 3.5 m. The speed of sound in seawater is
1540 m/s.
A frequency that is not an overtone of the fundamental frequency F is
F/2.
Radio amateurs are permitted to communicate on the "10-meter band". What frequency of radio waves corresponds to a wavelength of 10 meters? The speed of radio waves is 3 × 108 m/s.
3.0 × 107 Hz
A boat at anchor is rocked by waves whose crests are 50 m apart and whose speed is 10 m/s. These waves reach the boat once every
5 s.
To an astronaut in orbit around the earth the sky appears
black.
A sound wave whose frequency is 50 Hz
has a relatively long wavelength.
The setting sun appears red because its light is
scattered.
The wavelength of the wave shown in the figure is A= up and down C= on top of the curve
D.
Light of which of the following colors is scattered most in the atmosphere?
blue
Which of the following is not a property of an electromagnetic wave?
electric charge
Ultrasound refers to sound whose
frequency is too high for most people to hear.
The property of light waves that leads to the phenomenon of color is
frequency.
When a sound wave goes from air into water, the quantity that remains unchanged is its
frequency.
In a transverse wave, the individual particles of the medium move
perpendicular to the direction of travel.
When the American flag is viewed with red light it appears
red and black.
The ionosphere
reflects radio waves.
Sound waves of frequency 300 Hz have a wavelength relative to sound waves in the same medium of frequency 600 Hz that is
twice as great.
An example of a wave that is partly longitudinal and partly transverse is a
water wave.