The wavelength would decrease because frequency is inversly proportional to the wavelength provided the speed is constant: f=v/λ
<u>Answer:</u>
Chipmunk's average acceleration during the 2.07 s time interval = 0.1256 
<u>Explanation:</u>
We have equation of motion, v = u + at, where v is the final velocity, u is the initial velocity, a is the acceleration and t is the time taken.
In this case we need to find acceleration value, we have initial velocity = 1.47 m/s, final velocity = 1.73 m/s and time taken = 2.07 seconds.
Substituting
1.73 = 1.47 + a * 2.07
a = 0.1256 
Chipmunk's average acceleration during the 2.07 s time interval = 0.1256 
Answer:
v = 1.16 m/s
Explanation:
As per work energy theorem we know that work done by all forces on the sphere is equal to the change in kinetic energy of the sphere
So here we will have

here we know that

k = 8 N/m
now we have



Answer:
The work function of the metal is 2.226 eV.
Explanation:
Given;
wavelength of the violet light, λ = 427 nm = 427 x 10⁻⁹ m
maximum kinetic energy, K.E = 0.684 eV
The energy of the incident light is calculated as;

Apply Einstein's photoelectric equation;
E = Ф + K.E
where;
Ф is the work function of the metal
Ф = E - K.E
Ф = 2.91 eV - 0.684 eV
Ф = 2.226 eV.
Therefore, the work function of the metal is 2.226 eV.