Explanation:
This is a good example of Doppler effect
Given
Source velocity Vs=20m/s
Apparent frequency Fa= 5.2 Hz
Recall speed of sound V=340m/s
The frequency of the horn Fh=?
But mathematically Fh=(V-Vs/V)*Fa
(340-20)/340*5.2=4.89Hz
1. 
The frequency of a photon is given by:
where
c is the speed of light
is the wavelength
The wavelength of the photon in this problem is
So, the frequency of the photon is
2. 
The energy of a photon is given by
where
h is the Planck constant
f is the frequency of the photon
The frequency of the photon in this problem is
so its energy in Joules is
And since
The energy in eV is
The wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
Answer:
An applied force is a force that is applied to an object by a person or another object. If a person is pushing a desk across the room, then there is an applied force acting upon the object. The applied force is the force exerted on the desk by the person.
It states that the rate of change of velocity of an object is directly proportional to the force applied and takes place in the direction of the force. It is summarized by the equation: Force (N) = mass (kg) × acceleration (m/s²). Thus, an object of constant mass accelerates in proportion to the force applied.
Impulse = (force) x (time the force is applied)
Impulse = (25 N) x (0.16 sec)
<em>Impulse = 4 Newton-seconds</em>
