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

v = f + λ

Answer

v = f / λ

Answer

v = λ / f

Question 2

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

Accepted Answer

Superposition

Answer

Refraction

Answer

Diffraction

Answer

Polarization

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

6.8 m

Answer

170 m

Answer

0.068 m

Question 4

What type of wave is sound?

Accepted Answer

Longitudinal wave

Answer

Transverse wave

Answer

Electromagnetic wave

Answer

Standing wave

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

Waves bend around obstacles

Answer

Waves bounce off surfaces

Answer

Waves slow down in denser media

Question 6

What is the unit of frequency in the SI system?

Accepted Answer

Hertz (Hz)

Answer

Joule (J)

Answer

Newton (N)

Answer

Pascal (Pa)