EMB ERJ 170/175 ER/LR
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Wake Vortex Encounter
General Physical Injury / Incapacitation
Aircraft; Environment - Non Weather Related
In cruise at FL350 a 747 passed right to left 1000 ft above. There was no traffic advisory from ATC; and we did not see the overflying airplane till it was passing. We discussed turning left to parallel the wake or descend to avoid. These options were not possible with the limited time available. The seat belt sign was turned on and moments later we experienced light-moderate wake turbulence. I immediately called to confirm the FAs (Flight Attendants) were ok. They confirmed that although they we standing in the galley they were ok. A passenger who was returning from the lavatory did bump their head on the sidewall as they were taking their seat. FAs reported that they offered ice pack and assistance but the passenger declined. From first sign of overflying plane till we experienced wake was well under a minute. With even an extra 20 seconds we would have had time to avoid the wake. See and avoid or an ATC traffic advisory would have made this easy to avoid.
E175 Captain reported encountering light to moderate wake turbulence in cruise flight at FL350 from a B747 crossing their path at FL360.