If you double the wavelength l of a wave on a string, what happens to the wave speed v and the wave

1
Q15.1
If you double the wavelength l of a wave on a
string, what happens to the wave speed v and the
wave frequency f?
1. v is doubled and f is doubled 2. v is doubled
and f is unchanged 3. v is unchanged and f is
halved 4. v is unchanged and f is doubled 5. v
is halved and f is unchanged
2
A15.1
If you double the wavelength l of a wave on a
string, what happens to the wave speed v and the
wave frequency f?
1. v is doubled and f is doubled 2. v is doubled
and f is unchanged 3. v is unchanged and f is
halved 4. v is unchanged and f is doubled 5. v
is halved and f is unchanged
3
Q15.2
Which of the following wave functions describe a
wave that moves in the xdirection?
1. y(x,t) A sin (kx wt) 2. y(x,t) A sin
(kx wt) 3. y(x,t) A cos (kx wt) 4. both
2. and 3. 5. all of 1., 2., and 3.
4
A15.2
Which of the following wave functions describe a
wave that moves in the xdirection?
1. y(x,t) A sin (kx wt) 2. y(x,t) A sin
(kx wt) 3. y(x,t) A cos (kx wt) 4. both
2. and 3. 5. all of 1., 2., and 3.
5
Q15.3
A wave on a string is moving to the right. This
graph of y(x, t) versus coordinate x for a
specific time t shows the shape of the wave at
that time. What are the velocity and
acceleration of a particle at point P on the
string?
1. velocity is upward and acceleration is zero
2. velocity is downward and acceleration is zero
3. velocity is zero and acceleration is upward
4. velocity is zero and acceleration is downward
5. none of the above
6
A15.3
A wave on a string is moving to the right. This
graph of y(x, t) versus coordinate x for a
specific time t shows the shape of the wave at
that time. What are the velocity and
acceleration of a particle at point P on the
string?
1. velocity is upward and acceleration is zero
2. velocity is downward and acceleration is zero
3. velocity is zero and acceleration is upward
4. velocity is zero and acceleration is downward
5. none of the above
7
Q15.4
A wave on a string is moving to the right. This
graph of y(x, t) versus coordinate x for a
specific time t shows the shape of the wave at
that time. What are the velocity and
acceleration of a particle at point Q on the
string?
1. velocity is upward and acceleration is zero
2. velocity is downward and acceleration is zero
3. velocity is zero and acceleration is upward
4. velocity is zero and acceleration is downward
5. none of the above
8
A15.4
A wave on a string is moving to the right. This
graph of y(x, t) versus coordinate x for a
specific time t shows the shape of the wave at
that time. What are the velocity and
acceleration of a particle at point Q on the
string?
1. velocity is upward and acceleration is zero
2. velocity is downward and acceleration is zero
3. velocity is zero and acceleration is upward
4. velocity is zero and acceleration is downward
5. none of the above
9
Q15.5
The four strings of a musical instrument are all
made of the same material and are under the same
tension, but have different thicknesses. Waves
travel
1. fastest on the thickest string 2. fastest on
the thinnest string 3. at the same speed on all
strings 4. not enough information given to
decide
10
A15.5
The four strings of a musical instrument are all
made of the same material and are under the same
tension, but have different thicknesses. Waves
travel
1. fastest on the thickest string 2. fastest on
the thinnest string 3. at the same speed on all
strings 4. not enough information given to
decide
11
Q15.6
While a guitar string is vibrating, you gently
touch the midpoint of the string to ensure that
the string does not vibrate at that point. The
lowest-frequency standing wave that could be
present on the string
1. vibrates at the fundamental frequency 2.
vibrates at twice the fundamental frequency 3.
vibrates at three times the fundamental frequency
4. vibrates at four times the fundamental
frequency 5. not enough information given to
decide
12
A15.6
While a guitar string is vibrating, you gently
touch the midpoint of the string to ensure that
the string does not vibrate at that point. The
lowest-frequency standing wave that could be
present on the string
1. vibrates at the fundamental frequency 2.
vibrates at twice the fundamental frequency 3.
vibrates at three times the fundamental frequency
4. vibrates at four times the fundamental
frequency 5. not enough information given to
decide