1. If a bat emits 10 sounds in 5 seconds, what is the frequency of the bat's vocal outbursts (rounded to first decimal place)

My answer: 2.0 Hz

2.If one crest has a 3 cm amplitude and interacts with another pulse to produce a crest 8 cm high this demonstration"
a) constructive interference
b) destructive interference
c) doppler effect
d) a node

my answer: a

3. A standing wave is set up in a pool 24 m long which contains 6 loops. What is the wavelength?

my answer: 24m

4.Which of the following is not an example of wave motion?
a) The sound of a tuba
b) a vibrating slinky showing crests and troughs
c) a person dancing
d) a tsunami event occurring after the earthquake
e) an earthquake's energy travelling through the core of the planet

my answer: c

3 answers

I agree on all but #3.
If by loop they mean antinode they occur 6 times including the ends. The distance from a node to an antinode is 1/4 lambda.
I see ten quarter wavelengths in the 24 feet
so 10( lambda/4) = 24
lambda = 2.4 *4 = 9.6 meters

thanks a lot!

You are welcome.