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NEET UG Dual Nature of Radiation and Matter — practice questions — page 4

Explore 161 free Dual Nature of Radiation and Matter questions in NEET UG Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Dual Nature of Radiation and Matter questions and exercises with answers

Showing questions 91–120 of 161.

Hallwachs found that an uncharged zinc plate exposed to ultraviolet light becameRead the answer and worked solution →Which metal emits photoelectrons even under visible light?Read the answer and worked solution →Why does a photoelectric tube carry a quartz window?Read the answer and worked solution →Saturation current flows when the collector receivesRead the answer and worked solution →The least retarding potential that reduces photocurrent to zero is theRead the answer and worked solution →A plot of stopping potential against frequency for one metal isRead the answer and worked solution →The slope of the stopping potential versus frequency line equalsRead the answer and worked solution →Copper shows the photoelectric effect with which light?Read the answer and worked solution →Above threshold, photoelectric emission begins after a delay of aboutRead the answer and worked solution →Classical wave theory predicted that maximum photoelectron energy would rise withRead the answer and worked solution →Which observation could the wave theory of light NOT explain?Read the answer and worked solution →Wave theory estimated that, in dim light, an electron would need to absorb energy forRead the answer and worked solution →In which year did Einstein propose light quanta to explain photoemission?Read the answer and worked solution →A metal with a larger work function has a threshold frequency that isRead the answer and worked solution →Photons of 5.0 eV hit a metal of work function 2.0 eV. The stopping potential isRead the answer and worked solution →Light of wavelength 400 nm falls on a metal of work function 2.1 eV. Kmax is aboutRead the answer and worked solution →A metal's work function is 2.48 eV. Its threshold wavelength is aboutRead the answer and worked solution →A stopping potential of 1.5 V means the fastest photoelectrons carryRead the answer and worked solution →A photon of red light has wavelength 600 nm. Its energy is roughlyRead the answer and worked solution →Doubling the frequency of light on a photosensitive metal makes KmaxRead the answer and worked solution →Tripling the intensity of light at fixed frequency above threshold willRead the answer and worked solution →Millikan's photoelectric experiments were first aimed atRead the answer and worked solution →Millikan found Planck's constant from the V0 versus frequency line of which metal?Read the answer and worked solution →Einstein showed that a light quantum of frequency v carries momentumRead the answer and worked solution →Photons pass undeflected through electric and magnetic fields because theyRead the answer and worked solution →In vision, which step is best described by treating light as photons?Read the answer and worked solution →In which year did de Broglie propose that moving matter has wave properties?Read the answer and worked solution →De Broglie argued for matter waves mainly on the grounds ofRead the answer and worked solution →If a particle's speed doubles, its de Broglie wavelength becomesRead the answer and worked solution →An electron and a proton move at the same speed. Which has the longer de Broglie wavelength?Read the answer and worked solution →

Worked practice questions

Hallwachs found that an uncharged zinc plate exposed to ultraviolet light became

  1. Negatively charged
  2. Electrically neutral
  3. Strongly magnetised
  4. Positively charged
Show answer and solution

Correct answer: D. Positively charged

Ultraviolet light ejected electrons from the zinc, so the plate was left with a positive charge.

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Which metal emits photoelectrons even under visible light?

  1. Cadmium
  2. Zinc
  3. Magnesium
  4. Caesium
Show answer and solution

Correct answer: D. Caesium

Alkali metals such as caesium have low work functions and respond even to visible light.

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Why does a photoelectric tube carry a quartz window?

  1. To filter red light
  2. To pass ultraviolet
  3. To block X-rays
  4. To focus the beam
Show answer and solution

Correct answer: B. To pass ultraviolet

Quartz is transparent to ultraviolet radiation, letting it reach the photosensitive plate.

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