Answer:
The energy and the wavelength of the photon are 1.546 MeV and
.
Explanation:
Given that,
Kinetic energy = 261 KeV
Planck's constant 
Speed of light 
Mass of electron 
Charge 
(A). We need to calculate the energy of the photon
Using formula of rest mass energy



Energy in eV



The total energy of photon



(B). We need to calculate the wavelength of the photon
Using formula of wavelength

Put the value into the formula


Hence, The energy and the wavelength of the photon are 1.546 MeV and
.
Answer:
7 seconds
Explanation:
he went down -28 m/s so 7 times -4 equals -28 m/s which is what he needed to slowness down to 10 m/s
Yes you are correct...I dont think you need to do this? You are getting them all right but now your just wasting points..
But anyways you are correct. ♡♡
The kinetic energy of an object is given by:

where
K is the kinetic energy
m is the mass of the object
v is its velocity.
The comet in our problem has a mass of

and a velocity of

, so its kinetic energy is: