If the intensity of a sound is increased by a factor of 10, the sound level is increased by ___ dB.

If the sound level is increased 20 dB, the intensity of the sound is increased by a factor of ___.

The longest wavelength that can exist as a standing wave on a string 2.0 m long that is tied at both ends is ___ m.

The longest wavelength that can exist as a standing wave in an organ pipe 2.0 m long that is open on one end and closed on the other is ___ m.

The longest wavelength that can exist as a standing wave in an organ pipe 2.0 m long that is open on both ends is ___ m.

The following information pertains to Questions 6 and 7.

"You are caught in a narrow median of a street, and a small sports car is approaching you at a constant speed of 40 m/s. The engine of the car is emitting a sound at a constant frequency of 100 Hz, as heard by the driver of the car. You measure the speed of the sound of the engine and determine it to be 340 m/s on this windless day."

The pitch of the sound of the engine that you hear as the car approaches you is ___ 100 Hz.

After the car passes you and continues up the street with the same constant speed, you again measure the speed of the engine sound and find it to be ___ 340 m/s.