Question

(a) very loud
1. An electric bell is suspended in a bell jar and
then air is removed from it. On switching on
(C) weak sound (d) no sound is heard
2. The convenient instrument used in laboratory
. Tick (v) the most appropriate answer :
the electric bell, the sound heard is:
(b) normal sound
to produce pure sound is :
(a) whistle
(b) drum
(C) tuning fork
(d) guitar
3. The crack of a thunder cloud is heard later
than the flash of lightning because, the light
travels :
(a) much slower than sound
(b) much faster than sound
(c) at the same speed as sound
(d) none of these
4. The approximate speed of sound in air at room temperature is :
a) 33.2 ms-¹
b) 3320 ms -¹
c) 3.32 ms -¹
d) 332 ms -¹
​

Answer 1

Step-by-step explanation:

On the Data tab, in the Outline group, click Subtotal. The Subtotal dialog box is displayed.

In the At each change in box, click the nested subtotal column. ...

In the Use function box, click the summary function that you want to use to calculate the subtotals. ...

Clear the Replace current subtotals check box.