Author Question: A bat emits a sound at a frequency of 30.0 kHz as it approaches a wall. The bat detects beats such ... (Read 34 times)

lindiwe · **on:** Jul 29, 2018

A bat emits a sound at a frequency of 30.0 kHz as it approaches a wall. The bat detects beats such that the frequency of the echo is 900 Hz higher than the frequency the bat is emitting.

What is the speed of the bat? The speed of sound in air is 340 m/s.
A)

20.0 m/s

B)

15.0 m/s

C)

10.0 m/s

D)

30.0 m/s

E)

5.0 m/s

Question 2

Consider the four quantum numbers of an electron in an atom, n, l, ml, and ms. The energy of an electron in an isolated atom depends on

A) l, ml, and ms only.
B) n only.
C) n and l only.
D) n, l, and ml only.
E) all four quantum numbers.