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Quizzes

Quick multiple-choice questions shared by teachers and students.

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1796 quizzes
A cricket ball of 0.15 kg moves at 20 m/s. What is its de Broglie wavelength? Take h = 6.63 × 10⁻³⁴ J s. New
High School (11–12) · Dual Nature of Radiation and Matter
StemPy LabStemPy Lab
Medium
A hydrogen lamp glows violet at one Balmer line, made by jumps from n = 5 down to n = 2. Taking hc = 1240 eV nm, what is its wavelength? New
High School (11–12) · Atoms and Atomic Spectra
StemPy LabStemPy Lab
Medium
According to Bohr, what is the angular momentum of the electron in the nth orbit? New
High School (11–12) · Atoms and Atomic Spectra
StemPy LabStemPy Lab
Easy
In the same experiment (λ = 0.71 m, first resonance at 17.2 cm), what is the end correction? New
High School (11–12) · Superposition and Standing Waves
StemPy LabStemPy Lab
Hard
An organ pipe, open at both ends, is 0.4 m long. If sound goes at 340 m/s, what is its lowest note? New
High School (11–12) · Superposition and Standing Waves
StemPy LabStemPy Lab
Easy
A string vibrates with 4 loops at 360 Hz. What is its fundamental frequency? New
High School (11–12) · Superposition and Standing Waves
StemPy LabStemPy Lab
Medium
A student says: Closing one end of an open pipe doubles its fundamental frequency. What is wrong? New
High School (11–12) · Superposition and Standing Waves
StemPy LabStemPy Lab
Medium
A student says: Notes of 330 Hz and 335 Hz together give beats of 332.5 Hz. What is wrong? New
High School (11–12) · Wave Motion
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Medium
A train's horn of 600 Hz comes towards you at 30 m/s. Sound travels at 330 m/s. What frequency do you hear? New
High School (11–12) · Sound Waves and Hearing
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Medium
An ambulance passes you and drives away. What happens to the pitch of its siren that you hear? New
High School (11–12) · Sound Waves and Hearing
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Easy
A violinist plays a note an octave higher, at twice the frequency, in the same hall. What happens to the wavelength of the sound? New
High School (11–12) · Wave Motion
StemPy LabStemPy Lab
Easy
Rain falls straight down at 8 m/s. You walk at 6 m/s. How fast does the rain hit you, relative to you? New
High School (11–12) · Relative Motion
StemPy LabStemPy Lab
Medium
In the same rain (8 m/s straight down, you walking at 6 m/s), how should you tilt your umbrella? New
High School (11–12) · Relative Motion
StemPy LabStemPy Lab
Medium
A swimmer who can swim at 5 m/s in still water swims straight towards the far bank of a river 120 m wide that flows at 2 m/s. How long until she reaches the far side? New
High School (11–12) · Relative Motion
StemPy LabStemPy Lab
Medium
A student writes the velocity of B relative to A as vA - vB. What is wrong? New
High School (11–12) · Relative Motion
StemPy LabStemPy Lab
Easy
What is the wavelength of the line from n = 4 to n = 2 in hydrogen? Use hc = 1240 eV nm. New
High School (11–12) · Atoms and Atomic Spectra
StemPy LabStemPy Lab
Medium
Singly ionised helium, He⁺, keeps one electron. What energy does that electron have in the level n = 2? New
High School (11–12) · Atoms and Atomic Spectra
StemPy LabStemPy Lab
Medium
A hydrogen atom in its ground state takes in a photon of 13.22 eV. To which level does the electron go? New
High School (11–12) · Atoms and Atomic Spectra
StemPy LabStemPy Lab
Medium
A student says: The n = 2 level, at -3.4 eV, has less energy than the ground state, at -13.6 eV, because 3.4 eV is smaller than 13.6 eV. What is wrong? New
High School (11–12) · Atoms and Atomic Spectra
StemPy LabStemPy Lab
Medium
What is the threshold wavelength of a metal whose work function is 4.96 eV? Use hc = 1240 eV nm. New
High School (11–12) · Dual Nature of Radiation and Matter
StemPy LabStemPy Lab
Medium
An electron is accelerated from rest through 150 V. What is its de Broglie wavelength? Use λ = 1.227/√V nm. New
High School (11–12) · Dual Nature of Radiation and Matter
StemPy LabStemPy Lab
Medium
The stopping potential is plotted against the frequency of the light. What is the slope of the straight line? New
High School (11–12) · Dual Nature of Radiation and Matter
StemPy LabStemPy Lab
Medium
A student says: A very bright red beam must eject electrons, because it carries more energy than a dim blue beam. What is wrong? New
High School (11–12) · Dual Nature of Radiation and Matter
StemPy LabStemPy Lab
Medium
A heater uses 1.2 kW on a 240 V supply. What is its resistance? New
High School (11–12) · Current Electricity
StemPy LabStemPy Lab
Medium
A wire 25 m long has a cross section of 0.5 mm² and a resistivity of 1.6 × 10⁻⁸ Ω m. What is its resistance? New
High School (11–12) · Current Electricity
StemPy LabStemPy Lab
Medium
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