The wavelength of a wave with a frequency of 400 kHz is:
Inside the app
Everything for exam day. Nothing in the way.
Real exam focus, clear explanations and honest progress, in one calm app for day and night.
Real exam focus
Practise what students actually saw.
Switch on the real exam filter to practise only questions students reported from their exams, with the latest Last Seen date for each. After your sitting, share what you saw.
Illustrative
VOR and DMERadio navigationLast seen 12 days ago
Fronts and air massesMeteorologyPractice bank
Rules of the airAir lawLast seen 3 weeks ago
StabilityPrinciples of flightPractice bank
Great circlesGeneral navigationLast seen 5 days ago
3 of 5 questions in this session
Your progressIllustrative
82%
Performance
71%
Knowledge
64%
Question bank
This weekIllustrative3 days on target
MMon: met
TTue: met
WWed: partial
TThu: idle
FFri: met
SSat: missed
SSun: idle
A day turns green when you reach your question target at 75% accuracy or better.
Question MatchIllustrative
Challenge your friends.
Share a code, answer the same questions against the clock, and compare results. Create a Crew or join your Class to see where you rank. You choose what you share.
Join with code
A7K2
1Sam18/20
2You17/20
3Alex15/20
4Priya14/20
5Jonas12/20
Explanations
Understand every answer.
Quick revision
The wavelength is approximately 750 m for a 400 kHz radio wave.
Every lesson starts from the basics, then shows why the other choices don’t fit.
Mock exams
Get used to exam time.
44:59
Timed mock exams for every subject, then a full review of your answers.
107,324questions in our wider collection, across multiple qualifications. ATPL(A) launch coverage will be confirmed before student access opens.
13ATPL(A) subjects in the current preview, each mapped to its syllabus areas.
Always movingWe regularly review questions and explanations, informed by student exam reports.
Real exam labels and Last Seen dates are based on student reports.
Recommended nextIllustrative
General navigation76% explored
Keep building
Meteorology58% explored
Worth another look
Principles of flight42% explored
Your next focus
Personal recommendations
Know what to study next.
Your next exam, recent answers, and missed questions shape your next session, so time goes to the subjects that need it most.
Prioritise subjects for your upcoming exams
Return to mistakes and questions due for review
Filter by topic to work on the areas you find hardest
Students report questions they saw in their exams. Those reports power the real exam question filter and Last Seen dates. You can focus on reported questions or practise the rest of your bank, and add a report after your own exam.
How does the app help me choose what to study?
Recommendations use your upcoming exam subjects and dates, recent answers, missed questions, and review history. Explore your performance by topic, then filter a practice session to work on the areas you find hardest.
Can I practise as often as I want?
Yes. Repeat questions, revisit explanations, and build sessions around the subjects and syllabus areas you want to study. Timed mock exams let you test yourself when you are ready.
Can I study and compete with friends?
Question Match lets you share a code, take a timed challenge, and compare results. Create a Crew or join a Class to share selected statistics and see your rank. You control what you share; Match participants need access to the same question bank.
Can I try the app for free?
Yes. The dedicated free sample page has one question from our free bank per syllabus area across all 13 subjects with feedback and explanations. No account or payment card is required. Student access is coming soon, with a free sample plus planned 3-month, 6-month, and annual options. Prices and purchase terms will be published before enrolment opens.
Does the app tell me whether I will pass?
Your progress shows question coverage, performance, and areas that need practice. Readiness indicators guide your preparation; they do not predict or guarantee an exam result. The current preview covers 13 ATPL(A) subjects, with launch bank coverage still being finalised.
Make your next session count.
Real exam reports. Clear explanations. Practice focused on you.