1
ans
0
cmts
Question 222760
1
ans
1
cmts
Question 222758
0
ans
0
cmts
Question 211837
0
ans
0
cmts
Question 199380
0
ans
0
cmts
Question 187804
1
ans
2
cmts
Question 175059
0
ans
14
cmts
prove speed of sound in air
v=331+0.6Tc^° ((m/(sec)))
2
ans
0
cmts
Question 164009
0
ans
0
cmts
prove v=(√((F∙L)/m)) ?
0
ans
1
cmts
we know y=asin(ωt−kx) is
equation of wave
which velocity will be (ω/k)
But what will be the velocity of
a wave that is created from
superposition of two sine wave of
different velocity like bellow
y=5sin(6t−x)cos(13t−6x) ?
0
ans
0
cmts
we know the equation of a simple harmonic wave
going to left to right is,
y=asin((2π)/λ)(vt−x)
if we put t=0 and x=0 ,
we get y=0
and if we put t=0 and x=0.25λ ,
we get y= a !!
But How could this be possible?
How could right side particles start oscillating
before the left ones?Don′t we need a
certain time gap for right side particles
to start oscillating??
0
ans
0
cmts
Question 147396
0
ans
1
cmts
Question 141492
1
ans
0
cmts
Ocean waves are observed to
travel along the water surface
during a developing storm.
A Coast Guard weather station
observes that there is a vertical
distance from high point to low
point of 4.6 meters and horizontal
distance of 8.6 meters between
adjacent crests.The waves splash
into the station once every 6.2 seconds
Determine the frequency and
the speeed of these waves.
0
ans
0
cmts
Question #139669
1
ans
0
cmts
Question 132265
1
ans
0
cmts
Question 132264
0
ans
0
cmts
Question #111635
0
ans
1
cmts
Question 109470
0
ans
1
cmts
Question 82768
1
ans
0
cmts
Question 73111
0
ans
0
cmts
Question 61142
0
ans
0
cmts
Question 59956
1
ans
0
cmts
A space ship moving towards you at
0.5c shine a light at you.At what speed
do you see the light approaching?
1
ans
1
cmts
Question 58001
0
ans
0
cmts
Question 57784
1
ans
1
cmts
Question 54901
0
ans
1
cmts
Question 54163
0
ans
0
cmts
A sound wave of velocity 350m/s
is directed towards the surface of
the water. If the ratio of the
wavelength of sound in air to that
in water 150 ratio 475.Calculate
the velocity of the wave in water.
2
ans
0
cmts
An object 60cm tall is placed on
the principal axis of a convex lens
and its 30cm tall image is formed
on the screen placed at a distance
of 40cm from the object.What is
the focal length of the lens?
1
ans
10
cmts
Prof Kintush has a near point of
45cm and his far point is infinity.
What type of lens and focal length
should be recommended for his
normal reading?
1
ans
1
cmts
A student holding a 324Hz tuning
fork approaches a wall at a speed
of 6ms^(−1) .The speed of sound in air
is 336ms^(−1) .What frequency will
the student detect from waves
omitted from the fork and waves
coming from the wall?
1
ans
0
cmts
A particle of mass 2×10^(−27) kg moves
according to the following
y=5cos(((πt)/3)+(π/4))
find the maximum kinetic energy
1
ans
0
cmts
A wave has a wavelength of 1.5m,
calculate the phase angle between
a point 0.25m from the peak of the
wave and another point 1m further
along the same peak.
1
ans
1
cmts
The incident wave set up on a string
of length fixed at each end is given
by: y_1 =Asin(kx−wt)
i)what is the equation of motion
of the reflected wave,y_2 .
ii)obtain the resultant,y=y_1 +y_2
of the two waves.
iii)what type of resultant wave is
this?
iv)for what values of x will the
amplitud of the resultant wave
become zero?
v)for what values of x will y be
maximum?
1
ans
0
cmts
Two waves are represented by
y_1 =Asinωt and y_2 =Asin(ωt−δ).
What is the resultant of the two
waves?
ii)determine the amplitude of the
resultant wave and under which
condition will it be constructive or
destructive.
0
ans
4
cmts
An open pipe 40cm long and a
closed pipe 32cm long,with the
same diameter,sound the same
fundamental frequency in unison.
Find the end correction of these
pipes.
1
ans
1
cmts
A train travelling at 30m/s ,
approaching a stationary observer
emits a tone at a frequency of 480Hz.
If the speed of sound is 330m/s,
determine the frequency of the
note the observer hears.
0
ans
0
cmts
Determine the intensity level of
12 people′s speech,if each person
speaks with an intensity level of
60dB
1
ans
0
cmts
Find the velocity of the source
along the line joining the source
to a stationary observer if,as a
result of the motion,the frequency
of the note heard is
a)increased in the ratio 18:15
b)decreased in the ratio 15:18
1
ans
1
cmts
A sonometer wire 60cm long,under
a tension of 120N,vibrates in
unison with a turning fork of
frequency 512Hz.The wire is then
shortened by 2cm,the tension
remaining the same.If the fork
and wire are sounded together,how
many beats per second are heard?
What decrease in tension will be
required to restore the frequency
of vibration of the wire to the
original value?
1
ans
0
cmts
how do i prove
∫_o ^t cos 2(ωt+α)dt=0
1
ans
5
cmts
A mass oscillating on a spring
has amplitude of 1.2m and a period
of 2s.Deduce the equation for
the displacement x if the timing
starts at the instant when the masd
has its maximum displacement.
b)calculate the time interval from
t=0 before the displacement is
0.08m
3
ans
2
cmts
A body undergoing SHM about the
origin has its equation x=0.2cos 5πt.
Find its average speed from t=0 to
t=0.7 sec.
1
ans
2
cmts
Question 32076
1
ans
0
cmts
A wave of frequency 10hz forms
a stationery wave pattern in a medium
where the velocity is 20cms^(−1)
what is the distance between the adjacent nodes?
pls help..
1
ans
0
cmts
What is the difference between
angular frequency and angular
velocity?
