EJU EJU Science: Physics - Waves and Electricity

Question 1

What is the relationship between wave frequency (f), wavelength (λ), and wave speed (v)?

Accepted Answer

v = fλ

Answer

The wave equation v = fλ states that wave speed equals frequency multiplied by wavelength.

Question 2

In the EJU physics context, what phenomenon occurs when two waves overlap and their displacements add together?

Accepted Answer

Superposition

Answer

The principle of superposition states that when two waves meet, the resulting displacement is the sum of the individual displacements.

Question 3

A sound wave has a frequency of 500 Hz and travels at 340 m/s in air. What is its wavelength?

Accepted Answer

0.68 m

Answer

Using v = fλ, λ = v/f = 340/500 = 0.68 m.

Question 4

What type of wave is sound?

Accepted Answer

Longitudinal wave

Answer

Sound is a longitudinal wave because the particles in the medium vibrate parallel to the direction of wave propagation.

Question 5

Which of the following correctly describes the Doppler effect?

Accepted Answer

The observed frequency of a wave changes when the source or observer is moving

Answer

The Doppler effect is the change in observed frequency due to relative motion between the wave source and the observer.

EJU - Examination for Japanese University Practice Test