VCAA Physics How has understanding about the physical world changed?

This calculation incorrectly treats the given 125 m as the proper length ($L_0$) and solves for the contracted length. Since the observer on the spaceship is at rest relative to it, they measure the proper length, which must be longer than the contracted length measured by the outside observer.

The observer on board measures the proper length ($L_0$). Using the length contraction formula $L = L_0 \sqrt{1 - \frac{v^2}{c^2}}$, with $L=125$ m and $v=0.3c$, we rearrange to find $L_0 = \frac{125}{\sqrt{1 - 0.09}} \approx 131$ m.

This answer results from omitting the square root in the Lorentz factor calculation, dividing 125 by $(1 - 0.3^2)$ instead of $\sqrt{1 - 0.3^2}$.

This value is incorrect and does not align with the standard length contraction formula. It likely results from a calculation error or misapplication of the Lorentz factor $\gamma$.

Using a positively ionised metal would increase the electrostatic attraction on the electrons, effectively increasing the energy required to escape and decreasing the kinetic energy.

According to the photoelectric equation $K_{max} = h\nu - \Phi$, increasing the work function ($\Phi$) reduces the remaining energy available for kinetic energy.

Increasing intensity increases the number of photons and ejected electrons (photocurrent), but does not change the energy of individual photons or the maximum kinetic energy of the electrons.

Photon energy is inversely proportional to wavelength ($E = \frac{hc}{\lambda}$). Decreasing the wavelength increases the incident photon energy, thereby increasing the maximum kinetic energy of the ejected electrons.