Answer:
The frequency the listener hears is 911.765 Hz.
Explanation:
The speed of a sound is 340 m/s
The speed of listener is 30 m/s in a direction away from the whistle.
The speed of the listener with respect to the sound waves from the whistle
= ( 340 - 30) m/s
= 310 m/s
This because the direction of the sound waves from the whistle and the direction of travel of the listener are the same, that is, both are traveling away from the whistle.
Therefore from the formula we get
⇒ ⇒ =
The frequency the listener hears is 911.765 Hz.
Actually yes because my sis got a bruse in her body!
Answer:
1.-Deflection force
2.q-Charge
3.v-Velocity of the charge
4.B-Perpendicular magnetic field strength
Explanation:
We are given that magnetic deflection
We have to match each symbol in formula with what it represents.
In this formula
Deflection force
q=Charge of particle
v=Velocity of charge
B=Perpendicular magnetic field strength
Therefore,
1.-Deflection force
2.q-Charge
3.v-Velocity of the charge
4.B-Perpendicular magnetic field strength
Answer:
Potential difference = 245 V
Explanation:
First, we have to find velocity at which ionized molecules are accelerated into a magnetic field. Here, magnetic force acts as a centripetal force due to circular path of molecules towards detector slot.
- B= 0.25 T,d= 12 cm
- mass = (12+16+16)×1.67×10-27kg
Now, the magnetic force to the centripetal force equates as:
qvB = =
For Velocity (v) :
v =
According to law of conservation of energy, we know that the initial potential energy of the molecules is converted into kinetic energy as they enter into the magnetic field. So,
Substitute the value of v in above equation:
qV = m
V =
V= 245 V
Answer: Graphite and iodine are non-metals that have lustre.
Explanation:
Graphite is a non-metal which has metallic luster. Metallic lustre is due to presence of free electrons in them, generally non metals don't exhibit this property, but iodine and graphite are non metals they exhibit metallic lustre.