An infared wave has a wavelength of 1.5 x10^–6 m. The speed of this wave is 2.2 × 10^8 m/s. Calculate the frequency of the wave. Give your answer in standard form and to 2 significant figures.

First, I would highlight the numbers you need to use for this question and label them as v and λ. This makes them easier to find once you start inputting them into the calculator. Find the equation you need on your equation sheet, this will include speed (v), frequency (f) and wavelength(λ) - λ = v/f. Rearrange formula for f and write this down in your working - f = v/ λ. Substitute the numbers in the question into this equation to find frequency Answer is 1.5 x 10^14 Hz (make sure to write to 2 sig fig otherwise you'll lose a mark).

MH
Answered by Megan H. Physics tutor

2739 Views

See similar Physics A Level tutors

Related Physics A Level answers

All answers ▸

Describe the process of a capacitor charging.


In a fluorescent tube, how are the atoms in the tube excited?


Why is a pendulum with a bob of the same size but larger mass than another bob damped more lightly?


Show that a pendulum undergoes simple harmonic motion (SHM). State your assumptions. The pendulum is made up of a light inextensible string, attached to a ceiling at one end and with a particle of mass m attached to the other end.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning