A sound with a frequency of 15 Hz is in the ______________ region of the sound spectrum
Fill in the blank(s) with correct word
infrasonic
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(c) Two electrons with equal speeds, one moving east and one moving west, collide. After the collision, the electrons move north and south with smaller speeds than they had originally. Nothing else is emitted.
A. C B. F
The Sun rotates now with a rotation speed of about 2 km/sec. If its radius shrank to the size of Earth, about how fast would it spin?
A. 20 km/sec. B. 400 km/sec. C. 2,000 km/sec. D. 0.2 km/sec. E. 200 km/sec.
In a vacuum, which form of electromagnetic radiation travels slowest?
A) Visible light B) Radio C) Gamma rays D) Ultraviolet light E) All forms of electromagnetic radiation travel at the same speed.
A transformer for charging a power tool steps the line voltage down to 2.9 V. The output current of this transformer is 240 mA. If the transformer is 80% efficient, what is the input current?
A) 300 mA B) 7.3 mA C) 240 mA D) 190 mA E) 4.6 mA