A bat emits a sound at a frequency of 39.0 kHz as it approaches a wall. The bat detects beats with a frequency of 827 Hz between the sound it emits and the echo bouncing from the wall
What is the speed of the bat if the speed of sound in air is 343 m/s? A) 2.7 m/s
B) 3.0 m/s
C) 3.6 m/s
D) 5.4 m/s
E) 9.0 m/s
C
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Microwaves have ________ wavelengths and ________ energies compared to the visual band
a. shorter, higher b. longer, lower c. shorter, lower d. longer, higher
Constant Acceleration Kinematics: A car is moving with a speed of 32.0 m/s. The driver sees an accident ahead and slams on the brakes, causing the car to slow down with a uniform acceleration of magnitude 3.50 m/s2. How far does the car travel after the driver put on the brakes until it comes to a stop?
A. 4.57 m B. 9.14 m C. 112 m D. 146 m E. 292 m
A neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. This is because:
A. the ball becomes positively charged by induction B. the ball becomes negatively charged by induction C. the number of electrons in the ball is more than the number in the rod D. the string is not a perfect insulator E. there is a rearrangement of the electrons in the ball
Energy Levels: What is the ionization energy of the neutral hydrogen atom?
A. 27.2 eV B. 13.6 eV C. 6.8 eV D. none of the given answers