A neutron travels a distance of 24 m in a time interval of 3.6 x 10^-4 s. Assuming its speed was constant, find its kinetic energy. Take 1.7 x 10^-27 kg as the mass of the neutron:
Correct answer: A. 37.2 x 10^-19 joule
- A. 37.2 x 10^-19 joule
- B. 27.702 x 10^-19 joule
- C. 17.70 x 10^-19 joule
- D. 7.702 x 10^-29 joule
Explanation
The following is the solution:speed of neutron = distance travelled by neutron / time taken by neutron for covered that distance .speed of neutron = 24/3.6 × 10‐4 m/sspeed of neutron ( V)= 6.6 × 10⁴ m/sno ,kinetic energy = 1/2mv²K.E = 1/2 × 1.7 × 10-27 ×( 6.6 × 10⁴)² J= 1/2 × 1.7 × (6.6)² × 10-19 j=37.2 × 10-19 jso,K.E = 37.2 × 10-19.Hence the correct answer is A which is closest to the correct answer
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
Practise Work and Energy
748 free Work and Energy MCQs from Physics, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Physics questions like this
Physics is on 16 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Work and Energy questions
The rate at which work is being done is called:
A particle moves along the x-axis from x = 0 to x = 5m under the influence of a force given byF = 7-2x+3x2. The work done in the process is:
An automobile is moving forwards with uniform velocity due to the force exerted by its engine. If the force is doubled with the velocity remaining constant, what happens to its total power?
You push a heavy crate down a ramp at a constant velocity. Only four forces act on the crate. Which force does the greatest magnitude of work on the crate?
When velocity of body of mass 10 kg is increased from 2 ms-1 to 8 ms-1 then the work done of the body is:
A bullet of mass 20 g is fired with velocity of 2000 ms-1, the K.E of the bullet is: