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Quizzes

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Exam:
1226 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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP
StemPy LabStemPy Lab
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
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
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
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
NEET, Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
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
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
A wire is drawn out to 3 times its length, and its volume stays the same. What happens to its resistance? New
High School (11–12) · Current Electricity
NEET, Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
A student says: Adding one more resistor in parallel raises the total resistance, because there is more resistor in the circuit. What is wrong? New
High School (11–12) · Current Electricity
Board Exam, AP, A-Level, IB
StemPy LabStemPy Lab
Medium
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