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Frequency = 1 / (period) = 1/.4 = 2.5 Hz

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Q: What is the wave frequency of a periodic wave of 40 nanoseconds?
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What is the frequency of a wave that has a period of 40 seconds?

1/40 = 0.025 Hertz


A wave is moving at the rate of 40 cms. Its wavelength is 8 cm. What is the frequency of the wave?

It is 5 Hz.


What is wavelength of 40 hertz?

1 pulse every 40 microseconds is equal to a frequency of 25,000 hertz


What is the frequency of wave with time period 0.025 s?

f = 1/t = 1/0.025 = 40 Hz


What is the frequency of the wave moving at the rate of 40 cms. Its wavelength is 8 cm.?

Divide the speed by the wavelength.


A rectangular wave has a 60 percent duty cycle and a frequency of 50 Mhz how long is the signal low?

First of all there is no definition of retangular wave. Maybe your retangular is my square wave. and the answer is inconclusive unless you specify the 40% level.


How fast is a wave moving if it has a frequency of 10 Hz and there are 4 meters between crests?

10*4 = 40 metres per second


How the 40 meters wave length is equal to 7 mhz frequency?

It seems you are talking about radio waves. The wavelength (40 m) multiplied by the frequency (7 million / second) must equal the speed of light (300 million meters/second). It seems that in this example numbers, either the wavelength or the frequency, or both, are not expressed with a great accuracy. For example, if 40 meters is exact, the frequency would be close to 7.5 MHz.


What is the wavelength of an electromagnetic wave that travels 3 x 10 and has a frequency of 4 x 10?

wavelength=velocity/frequency (v/f). wavelength=(3x10/4x10)=30/40=.75 meters


What is the speed of a wave that has a wavelength of 20 cm and a period of 0.5 s?

The speed of a wave is equal to the product of wavelength x frequency. Just convert everything to standard units (wavelength to meters, frequency to hertz), multiply both, and you'll get the result, also in standard units (meters / second).


When the frequency and wavelength are known answerer?

Frequency refers to how many waves pass a fixed point in a unit of time. Frequency is measured in Hertz, or Hz, and one Hertz means a single wave passes a given fixed point in one second. Wavelength refers to the length of an entire wave, so either from crest to crest or trough to trough. If you know how many waves pass a given point in a unit of time, which is frequency, and how long the waves are, which is wavelength, you can find the wave's speed. For example, if a wave has a frequency of 10 Hz, so ten waves pass a given point in a second, and it has a wavelength of four meters, you multiply the frequency by the wavelength to find that the waves are traveling at 40 meters per second.


What is the frequency of a wave with a velocity of 100ms and a wavelength of 20m?

Frequency = Velocity / Wavelength = 100 m/s / 20 m = 5 s-1 or 5 Hz.