Home › NEET UG › Physics › Dual Nature of Radiation and Matter › Hallwachs found that an uncharged zinc plate exp…
Hallwachs found that an uncharged zinc plate exposed to ultraviolet light became
ANegatively charged
BElectrically neutral
CStrongly magnetised
DPositively charged
Answer & Solution
Correct answer: D. Positively charged
Ultraviolet light ejected electrons from the zinc, so the plate was left with a positive charge.
Related questions
A Vienna team in 1999 showed matter-wave diffraction for which molecules?Davisson and Germer's electron experiment demonstrated what?Davisson and Germer fired slow electrons at a crystal of which metal?An electron's de Broglie wavelength is comparable to the wavelength of which radiation?Why do everyday objects show no wave behaviour?A 0.12 kg ball moves at 20 m/s. Its de Broglie wavelength is about what?Two particles have equal kinetic energy, one four times as massive. Ratio of heavy to lighA proton and an alpha particle have equal speeds. What is λ(proton) : λ(alpha)?