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NEET UG Dual Nature of Radiation and Matter — practice questions — page 5

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 121–150 of 161.

A proton and an alpha particle have equal kinetic energy. Proton wavelength / alpha wavelength =Read the answer and worked solution →An electron and a proton have equal momentum. Their de Broglie wavelengths areRead the answer and worked solution →A 0.15 kg ball moves at 30 m/s. Its de Broglie wavelength is aboutRead the answer and worked solution →Why do everyday objects show no wave behaviour?Read the answer and worked solution →An electron at a few million m/s has a de Broglie wavelength comparable toRead the answer and worked solution →The group velocity of a matter wave equals theRead the answer and worked solution →The accepted specific charge e/m of the electron is aboutRead the answer and worked solution →Photoelectric emission converts light energy intoRead the answer and worked solution →In a photocell set-up, light intensity on the emitter is varied by changing theRead the answer and worked solution →Einstein won the 1921 Nobel Prize in Physics chiefly forRead the answer and worked solution →Who proposed that matter also has a wave nature?Read the answer and worked solution →In a photoelectric experiment, the minimum negative potential applied to the collector plate at which the photocurrent just drops to zero is called theRead the answer and worked solution →Name the physicistRead the answer and worked solution →True or false about photoemissionRead the answer and worked solution →Dual nature bingoRead the answer and worked solution →Complete the photoelectric ruleRead the answer and worked solution →NEET · Physics · Photoelectric — Spot the ErrorRead the answer and worked solution →Work function is usually measured in:Read the answer and worked solution →Photoelectric emission was discovered in 1887 by:Read the answer and worked solution →Below the threshold frequency, photoelectric emission:Read the answer and worked solution →Who explained the photoelectric effect in 1905?Read the answer and worked solution →In Einstein's picture, radiation travels as:Read the answer and worked solution →The number of photoelectrons emitted per second depends on the:Read the answer and worked solution →The kinetic energy of the photoelectrons is set by the:Read the answer and worked solution →Increasing the intensity of light leaves the stopping potential:Read the answer and worked solution →The work function of a surface depends on the:Read the answer and worked solution →Dual nature numbersRead the answer and worked solution →Match the photoelectric termRead the answer and worked solution →The negative voltage that just stops the current is called the:Read the answer and worked solution →Photoelectric emission begins after a time lag that is:Read the answer and worked solution →

Worked practice questions

A proton and an alpha particle have equal kinetic energy. Proton wavelength / alpha wavelength =

  1. 4
  2. 2
  3. 1/2
  4. 1
Show answer and solution

Correct answer: B. 2

Wavelength = h / sqrt(2mK), so with the alpha four times heavier the proton's wavelength is twice as long.

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An electron and a proton have equal momentum. Their de Broglie wavelengths are

  1. Longer for the proton
  2. Zero for the proton
  3. Longer for the electron
  4. Equal to each other
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Correct answer: D. Equal to each other

Wavelength is h/p alone, so equal momentum gives equal wavelength whatever the mass or charge.

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A 0.15 kg ball moves at 30 m/s. Its de Broglie wavelength is about

  1. 4.5 x 10^-30 m
  2. 1.5 x 10^-10 m
  3. 1.5 x 10^-34 m
  4. 6.6 x 10^-34 m
Show answer and solution

Correct answer: C. 1.5 x 10^-34 m

p = 0.15 x 30 = 4.5 kg m/s, and 6.63 x 10^-34 / 4.5 gives about 1.47 x 10^-34 m.

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