The correct answer for this question is letter "E.. The frequency of the resultant wave decreases." The magnetic fields inside the two solenoids compare can give t<span>he frequency of the resultant wave decreases, given two solenoids, with current twice as great and 4 times as many coils and 3 times long.</span>
This problem can be solved based on the rule of energy conservation, as the energy of the photon covers both the energy needed to overcome the binding energy as well as the energy of ejection.
The rule can be written as follows:
energy of photon = binding energy + kinetic energy of ejectection
(hc) / lambda = E + 0.5 x m x v^2 where:
h is plank's constant = 6.63 x 10^-34 m^2 kg / s
c is the speed of light = 3 x 10^8 m/sec
lambda is the wavelength = 310 nm
E is the required binding energy
m is the mass of photon = 9.11 x 10^-31 kg
v is the velocity = 3.45 x 10^5 m/s
So, as you can see, all the parameters in the equation are given except for E. Substitute to get the required E as follows:
(6.63x10^-34x3x10^8)/(310x10^-9) = E + 0.5(9.11 x 10^-31)(3.45x10^5)^2
E = 6.41 x 10^-16 joule
To get the E in ev, just divide the value in joules by 1.6 x 10^-19
E = 4.009 ev
Answer:
Explanation:
We can use Doppler equation to find the frequency of the siren.
First of all we have the police car moving behind the car. Hence, the frequency detected by the car will be:
(1)
Now, when the police car is moving in front of the car, the frequency detected by the car will be:
(2)
By solving equation (1) and equation (2) for 
we have:
Knowing that:
- f(car1) = 1310 Hz
- f(car2) = 1240 Hz
- Vs = 343 m/s
- V(car) = 35 m/s
Finally, we just need to put this value into the first equation to find frequency of the police car.
I hope it helps you!
It's C. Nitrogen is in group 5 so you'd need 5 dots
