Physics holds 894 questions with answers, free to read and with no account needed. They are grouped into 1 category: Physics.
Attempt each question before revealing the answer, and keep a note of the ones you get wrong — those are the topics worth reading about properly. If an answer looks wrong, there is a link to report it on every question.
Answer: A. fopen = 2 fclosed
Open organ pipes support fundamental frequencies twice that of closed pipes. Boundary conditions dictate wavelength modes for standing waves inside tubes. An open pipe contains antinodes at both ends, doubling the fundam...
Answer: A. Infinite
During free fall, the effective gravitational acceleration acting on a pendulum is zero. The standard formula for a pendulum's period involves division by effective gravity. Dividing by zero causes the calculated oscilla...
Answer: A. isothermal
In an isothermal expansion of an ideal gas, the system temperature remains completely constant. Constant temperature implies that internal energy change is zero throughout the thermodynamic process. According to the firs...
Answer: A. 6.625x1023N-s
Photon momentum is calculated by dividing Planck's constant by the photon wavelength. X-ray photons carry specific momentum values determined by their short electromagnetic wavelengths. Dimensional calculations using sta...
Answer: C. light form sodium lamp
A sodium vapor lamp emits light at very specific, tightly defined wavelengths, making it a standard source of nearly monochromatic light. The electronic transitions in excited sodium atoms produce dominant spectral lines...
Answer: C. Speed of lightB.
The question mentions speed of light related parameters, but the marked option contains a typographical artifact.
Answer: A. antinodes
Standing waves formed on vibrating strings exhibit alternating regions of minimum and maximum displacement amplitudes. Points along the string where particles experience the greatest oscillation displacement are designat...
Answer: D. wave front
A wave front connects all spatial points experiencing identical phases of vibration simultaneously. Points on the exact same wave front are always separated by integer multiples of wavelengths. This geometric representat...
Answer: A. 103 photons of wavelength 2 pm (γ-rays)
Photon energy is inversely proportional to its wavelength as described by the Planck-Einstein relation. Gamma rays possess the shortest wavelengths in the electromagnetic spectrum, resulting in maximum individual photon...
