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HPCET Dual Nature of Radiation and Matter — practice questions

Explore 41 free Dual Nature of Radiation and Matter questions in HPCET 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 1–30 of 41.

Photoelectric effect was explained by:Read the answer and worked solution →Photon energy:Read the answer and worked solution →de Broglie wavelength λ associated with a particle of momentum p:Read the answer and worked solution →In photoelectric effect, intensity of light affects:Read the answer and worked solution →Einstein's photoelectric equation:Read the answer and worked solution →Threshold frequency ν₀ for photoemission:Read the answer and worked solution →de Broglie wavelength of electron accelerated through V volts:Read the answer and worked solution →For very slow electron (low momentum), de Broglie wavelength is:Read the answer and worked solution →Davisson-Germer experiment demonstrated:Read the answer and worked solution →For photon, momentum p = E/c =Read the answer and worked solution →A metal has work function 2.0 eV. Light of wavelength 400 nm (3.1 eV) shines on it. Max KE of photoelectrons:Read the answer and worked solution →Threshold wavelength for a metal with work function 3 eV:Read the answer and worked solution →de Broglie wavelength of a 1 kg ball moving at 1 m/s:Read the answer and worked solution →For accelerated electron with KE = 100 eV, de Broglie wavelength:Read the answer and worked solution →Energy of photon with momentum 3.3 × 10⁻²⁵ kg m/s:Read the answer and worked solution →For photoelectric experiment, plot of KE_max vs frequency ν is:Read the answer and worked solution →In Compton scattering at 90° (cos 90 = 0), wavelength shift:Read the answer and worked solution →Maximum velocity of photoelectrons from a metal of work function 2 eV, illuminated by 200 nm light:Read the answer and worked solution →de Broglie wavelength of proton accelerated through 1000 V:Read the answer and worked solution →Photon flux (photons/sec) for 1 W of green light (λ = 550 nm):Read the answer and worked solution →Heisenberg uncertainty: for an electron in atom (Δx ~ 10⁻¹⁰ m), minimum momentum uncertainty:Read the answer and worked solution →NEET · Physics · Photoelectric — Spot the ErrorRead the answer and worked solution →Trace photoelectrons to their causeRead the answer and worked solution →Knock out the photoelectric mythsRead the answer and worked solution →Knock out the false photon claimsRead the answer and worked solution →Catch the false line on lightRead the answer and worked solution →Intensity or frequencyRead the answer and worked solution →Place the discoveriesRead the answer and worked solution →Who did whatRead the answer and worked solution →Type the quantum termRead the answer and worked solution →

Worked practice questions

Photoelectric effect was explained by:

  1. Galileo
  2. Einstein (1905, light as quanta of energy hν)
  3. Newton
  4. Faraday
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Correct answer: B. Einstein (1905, light as quanta of energy hν)

Einstein won 1921 Nobel Prize for explaining photoelectric effect: light comes in discrete energy packets (photons) of energy hν. Classical wave theory could not explain observed features.

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Photon energy:

  1. Planck constant alone
  2. hν (= hc/λ)
  3. kT
  4. mc²
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Correct answer: B. hν (= hc/λ)

We have E = hν. So E = hc/λ. h = 6.626 × 10⁻³⁴ J s (Planck's constant). Higher frequency (shorter wavelength) = higher energy photons.

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de Broglie wavelength λ associated with a particle of momentum p:

  1. hc/p
  2. h × p
  3. h / p (wave-particle duality)
  4. p / h
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Correct answer: C. h / p (wave-particle duality)

λ = h/p. Every moving particle has wave-like properties with wavelength inversely proportional to momentum. For ordinary objects λ is unmeasurably small for electrons λ is on atomic scale.

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