Question

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Answer 1

The experiment that can be used to show that water is a poor conductor of heat is as follows; Take a hard glass test tube and into it drop a tiny ice cube wrapped in a wire-gauze. ... It is noted that water starts boiling near the top but the ice does not melt. This experiment shows that water is a poor conductor of heat.

Answer 2

Answer:

A violin string vibrates with fundamental frequency of 220 Hz. The frequency of first overtone is A 440 Hz (B) 420 Hz © 410 Hz D 400 Hz

Explanation:

Frequency of oscillation of string in n

th

harmonic is

2l

nc

.

where c is the speed of the wave in the string.

Since the string vibrates in 4 segments, n=4

400=

2l

4c

⟹

2l

c

=100

Fundamental frequency f

1

=

2l

1×c

=100Hz