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Explain how a stationary wave is produced when a string fixed at both ends is plucked

When the string is plucked, waves will travel from the point where it was plucked to the fixed ends, which cannot move and so must be nodes. The waves will reflect, and the superposition of the reflected and...
JT
Answered by James T. • Physics tutor
16369 Views

What is the general equation for the alpha-decay of a nucleus X, with nucleon number A and proton number Z, into nucleon Y??

A Z X --> A - 4 z - 2 Y + 4 2 α During alpha-decay, the nuclus emits an alpha particle which consists of two protons and two neutrons (a totoal of 4 nucleons). Therefore the new nuclide formed will have a...
CT
Answered by Chloe T. • Physics tutor
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In a lab a hydrogen spectral line is observed to have a wavelength of 656nm. This line is observed in a distance galaxy to have a wavelength of 661nm, what is the recessional velocity of the galaxy?

This question is dealing with phenomena of Redshift, where wavelengths are shifted due to movement between observer and event. The key information to extract from the question is we have a rest wavelength, a...
JM
Answered by Jamie M. • Physics tutor
6798 Views

Hydrogen has a single proton and a single electron. Find the electric potential at a distance of 0.50 * 10^(-10) (m) from the proton.

Ve = kQ/r = ((8.99 * 10^9) * (1.6 * 10 ^-19))/(0.5 * 10^-10) = 28.77 = 29 V
PM
Answered by Pablo M. • Physics tutor
2796 Views

A car of mass 1000 kg is travelling at 20 (m/s). The car crashes into a tree, and comes to a complete halt in 0.05s. Calculate the force acting on the car during the collision.

We are asked for the force acting on the car and we know from Newton's second law that F = ma Therefore, we need to calculate the acceleration first. We use a = (vf - vo)/(t - to) where vf = final speed, vo ...
PM
Answered by Pablo M. • Physics tutor
3969 Views