Question
A soap bubble expands isothermally and its radius
doubles. The work done by surface tension during this expansion is:Solution
When a soap bubble expands, work is done against surface tension to increase the surface area. A soap bubble has two surfaces (inner and outer), so total surface area is twice that of a single sphere. Let:
- Initial radius =
- Final radius = 2R
- Surface tension = T
Which is the precursor of ethylene?
Botanical name of jowar is:
Which physiological disorder in cotton is caused by excessive nitrogen and results in vigorous vegetative growth but poor boll formation?
Which floral mechanism helps promote autogamy (self-pollination) in lettuce?
Two main components of sales promotion are ______.
Which soil-forming factor is classified as “active”?
The main host tree of Eri Silkworm is
Saline soil having
(A) pH<8.5
(B) E.C.>4
(C) ESP<15
(D) Physical condition - Flocculated
Choose the correct answer from the options given below:
Which statement is true?
Cotton and pigeon pea are:
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