Question
A train approaches a stationary observer with a speed of
36 km/h. It emits a sound of frequency 500 Hz. If the speed of sound is 340 m/s, what is the apparent frequency heard by the observer?Solution
The apparent frequency (f′) heard by a stationary observer when a source is moving towards them is given by the Doppler effect formula: 
In angiosperms, double fertilization involves:
- Which organ is primarily responsible for detoxifying harmful substances?
Which of the following equation is correct about Verhulst-Pearl Logistic Growth ?
What is the primary cause of hypertension (high blood pressure)?
Small bubbles are perfectly spherical because of –
In the names Mangifera indica (mango), Solanum tuberosum (potato), and Panthera leo (lion), what do the names indica, tuberosum, and leo represent?
The human eye is most sensitive to yellow-green light having wavelength -
A “wild type” organism that does not need any additional growth supplement is known asÂ
In roots, the protoxylem lies towards the periphery and the metaxylem towards the center. This arrangement of primary xylem is called:
Which of the following hormones increases blood glucose levels?
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