Question

Comprehension for (Q.No.34 to 0.No.15)
The speed of periodic wave motion is related to the frequency and wavelength of the waves. We
can understand this by considering the simple case of water waves. Imagine that we fix our eyes
on a stationary point on the surthee of water and observe the waves passing by this point. We can
measure how much time passes between the arrival of one crest and the arrival of the next one (the
period), and also observe the distance between tuvo consecutive crests (the wavelength). We know
that speed is defined as distance divided by time. In this case, the distance is one wavelength and
the time is one period, so wave speed wavelength period.
DOO
Wavelength
DO
Ooo
34.
Since period is equal to the inverse of frequency, the formula can also be written as
Wave speed = wavelength frequency
This relationship holds true for all kinds of waves, whether they are water waves, sound waves, or
light waves.
If a train of length 63 m having 7 freight cars rolls by you at the rate of three cars each second, what
is the speed of the train? SEDOM Fdmr.
(1) 6 m/s
(2) 7 m/s
21 m/s
(4) 42 m/s
Suppose a sound wave and an light wave have the same frequency. Which has the longer wave-
length?
(1) Sound wave
(2) Light Wave
(3) Both have same wavelength
(4) Data insufficient
7/14
Sad - 63 -21
35.​

Answer 1

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